First Experiments with the Zpacks Duplex Flex Tarp

Tucked quietly away on the zpacks website is the Duplex tarp. That’s the Duplex tent minus the groundsheet and bug netting. Or maybe the duplex tent is the tarp plus the groundsheet and bug netting?

Why I am I being facetious? The way the Duplex tarp is presented, or should I say not presented, one could come to conclude that the tent came before the tarp. Or the tent is so vastly superior to the tarp that the tarp isn’t even worth considering. There’s not even a picture of the Duplex tarp on the zpacks website. There’s just an option to buy the tarp, sight unseen. Please correct me if I’m wrong, but there’s not a single photo of a Duplex tarp on the web, to my knowledge.

With some long walks on my horizon I wanted a shelter that could do it all. I’m already a flat tarp user and while I love having a flat tarp it usually takes me about an hour altogether to get set up perfect. The time it takes from site selection to locking the bug net down can seem like a eternity.

Don’t get me wrong, I enjoy this process. Having a flat tarp means every shelter is customised to your selected site. I enjoy this on walks less than two weeks long but any longer than that and I want a shelter that can be put up quickly and assuredly.

Coming from the perspective of a flat tarp user, I wanted a shelter that could give me the versatility of a flat tarp and the convenience of a freestanding tent. Oh yeah, and it needed to be light. Ultralight. What about bomb proof? What about with massive floorspace? Sound impossible?

So do I take a gamble on the Duplex tent without the groundsheet and bug netting? I’m thinking well, you’re a bit over walking poles. You have been using a zpacks staff for a few years. I love the staff but they’re not the best shelter support unless the peak is the same height as the staff (you have to take the staff apart and then the height is not micro-adjustable).

Also, I said to myself, I want to be able to write while I’m walking. Furthermore, I like picking my nose a lot, and walking poles and nose picking do not go hand in hand.

That was the limit of my thought processes.

I picked the woodland/camo because it’s a bit thicker and a bit darker inside.

Enter the ‘Flex’ freestanding poles. These are some carbon fiber poles that zpacks get from Easton. They weight 280 grams. When the ‘Flex’ freestanding poles were released by zpacks some of the critics over at the Backpackinglight forums chucked in their two cents. Here are some of the objections:

“This flex design seems to me more a case of trying to make the flexible poles fit the design of the Duplex rather than making the most of the poles by having 2 longer continuous poles that cross on each side of the shelter and redesigning the shelter to suit the poles.”

“The idea of using a Duplex without trekking poles sounds cool, except of course the addition of 12oz poles eats a lot of the weight savings that makes the Duplex so great.”


“Hmm… agreed… just looking at it, intuitively I don’t see how it can withstand a substantial wind load without collapsing, let alone a good dump of snow. Can that ridge line really support as much tension as one pitched with trekking poles? Looks as if Joe had a pretty good test venue there… Scotland?
But even if it does work, I too cannot see carrying around an extra 11 ounces when I’ve got two perfectly good trekking poles weighing 7.2 oz total.”

The overall consensus was that the ‘Flex’ poles were superfluous ‘if you walk with trekking poles’. A lot of the comments also said that they had never had a situation where  a non-freestanding tent was difficult to pitch easily. Having had some experience with non-freestanding tents, I find this statement hard to believe. I like a drum tight pitch and will spend ages re-positioning stakes and tightening  guylines until it works the way I like. Some people I’ve seen can set their non-freestanding tent up and not care.

For me however I don’t want to carry walking poles and I prefer to have a floor-less shelter. The more I thought about a Duplex tarp combined with the freestanding poles, the more the combination started to make sense. Since I’m limiting my options to not having walking poles, for this comparison I presume you would be carrying the carbon fiber poles with the Duplex tent (not the freestanding poles) that zpacks sells that go into the peaks.

For those of you who don’t have a clue what I’m banging on about, this is the Duplex tent:


You’ll notice the groundsheet and the netting is sewn to the tarp. You’ll also notice that there are two poles keeping the tent up, one in the middle of each door. These are the dedicated carbon poles zpacks sells. Many hikers use their walking poles to keep the tent up instead of the carbon poles pictured.

I’m comparing the above to this:

IMG_1585 (1).jpg

In this photo the netting and the groundsheet are connected but they are separable. There are a variety of groundsheets and nets you can use instead of the ones shown. The netting creates an inner (second) cocoon for the sleeper, this is called a double walled tent. The poles keeping the tent up are on the outside of the canopy and do not require stakes to keep it up.

Some astute readers might point out that the comparison isn’t fair – a non-freestanding single wall Duplex versus a freestanding double walled modular Duplex? Apples and oranges, as the saying goes. Yes, but I’ll give the non-freestanding a head start.

Now, the all important weight numbers.

From the zpacks website, the Duplex full tent numbers are:

– The Duplex Tarp with taped seams and sewn in linelocs weighs 9.5 ounces (269 grams)

– The included guy lines and door clips weigh about 1.2 ounces (34 grams)

– The sewn in Cuben Fiber bathtub floor and bug screen weighs 10.0 ounces (284 grams)

– The included medium-plus 7″ x 13″ stuff sack adds .3 ounces (8 grams)

– The total weight for the packed tent is 21.0 ounces (595 grams).

– If you’re carrying the dedicated carbon poles they’re 60 grams each, so + 120 grams

Total = 715g.

On the other hand, the freestanding Duplex tarp combination comes in at:

– The duplex tarp alone is 9.5 ounces or 269 grams.

– The flex pole set and hardware is 10 oz or 282g.

– Add your own groundsheet (MLD DUO 60g, or zpacks solo bathtub 91g)

– Bug net = Sea to Summit solo nano = 80 grams.

– Guylines = 34 grams

Total = 725g.

Starting to get interesting?

Both weights do not include stakes. Arguably you’ll need less stakes for the freestanding tent than the non-freestanding tent. You could argue you don’t need any stakes, just like Joe does in his set up video.

Zpacks says the non-freestanding tent requires a minimum of 8 stakes, so at 6 grams a piece (for some shepherd hooks and carbon stake combo) = 48 grams, bringing the total to 763 grams.

From my limited experience with the freestanding Duplex tarp (in windy conditions) you’ll need 6 stakes as a minimum; so 12 grams less, bringing the total to 761 grams.

EXACTLY the same weight. A double walled tent at the same weight as a single walled tent? I’m in.

You could use a bivy instead of the groundsheet/net combo as well, saving weight but sacrificing sleeping space.

I saved up and watched the poor AUD/USD exchange rate put the object a few more weeks out of reach and then placed my order and waited eight weeks.

Okay here’s some photos:


Above: Duplex Flex tarp with shortened x-therm max. Note no bug net.


The interior space is huge. With all the doors closed there’s 2.2m to roll around in.


Above: with the DUO Sea to Summit bug net. I’ve since figured out the corners of the bug net are better off being hooked to where the tarp poles meet the ground.


Above: There are two mid panel tie outs. I’ve read in various places the panels can flap around a lot in high winds. Maybe having two tie outs will help? With the mid-panel toggle connecting the freestanding poles to the tarp there is more head room in the center of the tarp by default.

Not having used a Duplex tent, here are my imagined advantages and disadvantages of the Duplex freestanding tarp over the non-freestanding Duplex tent (integrated floor and bug netting). Some of these comparisons apply to all modular floor-less tarps to integrated tents.

Firstly, price:

When you factor in the price of the carbon poles the Duplex tent is $600 (USD) plus $60. If you had a freestanding full Duplex tent, you’re looking at $750 USD.

The Duplex tarp is $375 USD plus $150 for the Flex poles totaling $525. You then have to factor in the bug net and groundsheet price; S2S bug net ($40USD) and tyvek or polycryo ($10).

Next, set up.

One advantage of the integrated full Duplex tent is that there would be a little bit less stuffing around. Maybe ‘stuffing around’ is the wrong phrase – perhaps, ‘less initial set up time’ is more accurate. I’ve spent a few hours cutting bungee cords and getting the inner net working.

The apparent convenience of the integrated tent comes at the cost of versatility.

As said, for me, I value versatility and ‘modularity’ over maximum convenience. In the context of the freestanding duplex tarp against the non-freestanding duplex tent the convenience is subjective. The floor-less freestanding tarp is more convenient if you’re ‘cowboy camping’ and it starts raining in the middle of the night.  In this video I have a waterproof shelter erected in less than 3 minutes. Keep in mind this is probably the fourth time I have set the tarp up. (The first night I set the tarp up was a day before this in the dark and drizzling rain.)

One of the coolest things for me is that you can plonk the tarp over the top of your sleeping bag, mattress and groundsheet. You can’t do that with an integrated tent.


Other advantages of the modular Duplex tarp over the non-freestanding Duplex tent:

I can unhook the inner and use the inner with the freestanding poles and have a freestanding net tent to use in bug infested areas on clear nights or during the day when the flies are out.


When decamping I can lift the tarp up and move it away from the contents inside. No crouching and crawling in and out of the tent as I pack my backpack. Bonus.

I can then make the walls vertical of the freestanding tarp and let it dry while I finish packing up. Bonus.


Did I say there are no poles in the doorway?

What if it’s blowing a gale? I can set the tent up with both the inner poles/walking poles and the freestanding poles together. You can grab a stick or two in bad weather to support the ‘Flex’ mode. Bombproof.

Shepherd hooks are actually useful in the corner tie-outs where the poles meet the ground. The tension in the carbon poles pulls the stake loop taught meaning the shepherd hooks won’t rotate and flip out. In fact, in these corners shepherd hooks work better than larger stakes because they are easier to fit in.

You can set it up with the walls vertical or with the walls more horizontal depending on the site size.

Even in a light wind you need at least two stakes to keep the tarp down.

You can carry it around one handed. If I set up on an ants nest, moving is quick.

Finding a flat site is not as critical with a floor-less tarp. The corners of the freestanding tarp can be staked down if one pole hangs in the air. There is no sagging of the bathtub floor if you’re on a uneven site, as discussed at Willis Wall.

With the bug netting set up this is a double walled tent. I already owned a Sea to Summit nano solo and double net-tent from my flat-tarp days. These work well in my opinion. The double wall will collect condensation that gets dislodged when the tarp shakes in wind or by large drops from a tree.

A few companies make inners that would be appropriate for the Duplex tarp. zpacks once made one, but do not offer them for unknown reasons. They do offer a single door hexamid. I was wrong, they don’t.


Above: the elusive zpacks Duplex inner. Maybe this year zpacks will offer the inners?


Above: Tarptent make a few that might work?


Above: Six Moon Designs make a Haven net tent. The ridge line is off centre though, so I’m not sure if it’ll work.

Can you think of any others? Please share. (If you have a good condition second hand one of these inner nets, please message me)

I might try one of these one day but for the moment I’m happy having the bug net and groundsheet separate. If I have the full double walled tarp and bug net set up I can leave the groundsheet and contents where they are on the ground and pull the upper way out of the way. Alternatively I can set up the groundsheet and mattress etc as I need them and add the bug net or tarp later. Usually at lunch or at the end of the day you just want to throw your groundsheet and mattress down and not have to think about how everything is going to work.

Some people like having a seamless groundsheet and bug net, which I can understand. You can get the Sea to Summit bug net and groundsheet pretty tight, especially with oversized tyvek or the polycryo. It won’t be a ‘perfect’ seal though.

Speaking of groundsheets, with this set up they are interchangeable as they wear out.

If there is a downpour in the middle of the day, I do not mind setting the tarp up to sit out the worst of it. When I owned a non-freestanding tent even if I was walking in four foot of water I couldn’t be bothered setting the tent up at lunch-time. Lunch didn’t occur on those days.

This for me defines the beauty of the Duplex ‘Flex’ Tarp – its simplicity. For long hikes I want a shelter I want to use, not a compromise for weight savings. Psychologically I know it’s easy and I know it works. I want to put it up, even when it’s not raining, because it’s so easy.


Shout out to John Abela for talking through the options with me before making this purchase.

Lastly, here is an example of a summer gear list with the MLD Core pack pictured above.

After Heat

This story appeared in Rumble Strip. 

Sorcha told me that whenever she walks in the wind blown streets of Fremantle, she always tends to think of the place underwater. She said she doesn’t know exactly how the buildings will change, but some will have a permanent watermark and their basements and ground floor will become fish tanks. The warming air is warming the oceans and melting icesheets and sea levels are predicted to rise as much as one point one metres over the coming decades and if the seas rise a salt water triangle beginning at the northern end of Packenham street, to Bathers beach, to Little Creatures and then up to South Terrace will all be inundated, the waters rising and falling with the tide each day. The skatepark that runs south-east along the line of the train tracks within the grounds of the Esplanade park will have water rising half way up the half pipes and filling the bowls. This, she said, as if she had been pondering the image for some time, will be an unexpected reversal, as swimming pools are usually drained to make bowls for skateboarding.

Sorcha said you can feel the planet getting hotter and nowadays nobody goes out during the middle of the day and just last night, the temperature rose two point five degrees from 11pm to 1am and has continued to rise all morning until only the brave or those with air-conditioning venture out. The heat, especially standing in direct sunlight, is hot enough to burn the dash board of cars and many arguments have erupted about the apparent ownership of shaded parking bays closest to the markets or to the Woolstores shopping centre. These violent outbursts directed at complete strangers occur daily and onlookers are seen filming the incidents on their mobile phones to upload on social media. I too, began Sorcha, witnessed one of these outbursts, when a woman with black hair and black clothing had been attempting to reverse into a parking bay and a man snuck into her spot near a paperbark tree. When the passengers of the mans car opened their doors they were ambushed by the woman, speaking in Cantonese, which they understood, except for the driver who instructed the woman to get lost, before making his way through the steaming vehicles to the food court. The irate woman who missed her spot left her car stationary in the middle of the car park causing a traffic jam and all kinds of honking from other drivers. As the passengers were following the man to the food court they spotted another car leaving and stood at the entrance of the bay until the angry woman was able to slowly reverse her late model Mercedes into the spot and hastily throw her foil sun protection screen inside the windscreen and secured it with the visors. I often wonder, said Sorcha, if people suddenly find themselves at a breaking point and lose their shit one day or live their lives going from one confrontation to another without realising.

Allan Handelman and Bon Scott interview

In all of the hundreds of AC/DC books, videos and interviews, one of the best is an interview between legendary music man Allan Handelman and Bon Scott. This was recorded just a month or so before Bon’s death, in early 1980. An excerpt from the interview is included at the end of Bad Boy Boogie: The Adventures of Bon Scott, but you can listen to the entire interview at the link below. The interview proper begins after about a minute or two.

Click this LINK to listen to the interview. What are your thoughts?

If the Buffalo is the National Mammal, is Biological Warfare the National Military Strategy?

Memories of the People

buffalo4In an all-too-common example of revisionist history, NPR’s story of the bison becoming the “National Mammal” recounted the near-extinction of the species during American expansion while completely failing to mention that the buffalo slaughter was a deliberate military strategy in the ethnic cleansing of Native Americans from the Plains.  In fact, NPR even listed subsistence hunting by Indians as a contributing factor in the demise of the buffalo.

In 1868, General Sherman wrote to General Sheridan, “As long as Buffalo are up on the Republican [River] the Indians will go there. I think it would be wise to invite all the sportsmen of England and America there this fall for a Grand Buffalo hunt, and make one grand sweep of them all.”

A year later, the Army Navy Journal reported, “General Sherman remarked, in conversation the other day, that the quickest way to compel the Indians to settle down to civilized life was to send…

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Extinction by Thomas Bernhard – a quick review

Yesterday I finished reading Extinction by Thomas Bernhard. The novel took about two weeks for me to read and during that time I have taken the train to Armadale, walked about 100km on the Bibbulmun track and traveled around north east Bali. My copy now has dried chocolate on the cover, some black residue on the outside from my girlfriends purse, a few dog ears and various notes in different coloured pen throughout. The Vintage edition has a pretty poxy cover but the contents inside make up for that.

I wasn’t looking for any technique or angle in particular as I read. Extinction is a novel I was able to sit back and enjoy and let the author take me on a ride through the main characters psyche. The novel is one long monologue inside the ideas and thoughts of Franz-Josef Murau after he receives a telegram that his parents and brother have died in a car accident. It feels more appropriate to say the novel is separated into two paragraphs than two chapters. The first chapter is one paragraph and the second chapter is one paragraph. There are no breaks. At first this seems a little daunting but after fifty or so pages you get used to it and by the end you start to wonder why all books are not written like that. Actually, Extinction is the kind of book that is unique. Without the paragraph breaks you can see how this would force the writer to examine closely how enmeshed each of their ideas are – how interlinked each event and scene is and if they are not seamless, more words need to fill out the gaps until the bridge is crossed.

With the long paragraphs and deep psychological examination of the characters you can draw comparisons to Austerlitz by Sebald. In an interview Sebald acknowledges Bernhard as an influence. [At the 14:50 section of this interview] The influence on Austerlitz from Extinction becomes clear once you start reading both. Sebald calls Bernhard’s unique form of narration ‘periscopic’, where we receive the story through the voice of one character inside of another of another. The sentences in Austerlitz are much longer than those found in Extinction. I’m not sure which novel influenced Bernhard to write Extinction, but finding out will be a great pleasure for me.

Sebald is much more tender with his characters, but both authors are uncompromising in their pursuit of challenging the power structures of our society that lead us away from being kind to one another. You could argue that Extinction deals with the aftermath of WW2 more directly than Austerlitz, but I would prefer to say that WW2 is more of an open wound to the character Franz-Josef Murau, than Austerlitz. Bernhard is more about subterfuge from within, whereas Sebald is more about personal understanding around the periphery.

I remember reading a few years ago in one of the many how to write fiction books, that your characters should have attitude. Murau, the main character of Extinction, has a lot of attitude. By attitude I mean the character has convictions and is not afraid of sharing them. This attitude will put a lot of people off Extinction. But this is what I liked. We are told that having strong convictions can be isolating, because you can be shown to be a hypocrite, or you never know what lead these other people to behave the way they do. Just because you don’t necessarily agree with someones convictions at least they have convictions, and it is this premise that appears to underline Bernhard’s work.

You could say Extinction is an exercise in ridiculousness. It is ridiculousness that verges on the hilarious. I’m not sure I would keep reading if the voice of the novel continued on ranting and ranting without dipping into the ridiculous from time to time, to remind us that he’s taking us to the extremities of his consciousness – as far as that can conveyed through words on a page. The rant, or stream of consciousness, unravels in a cascading swirl where the topic of discussion is repeated or referred back to until the subject is covered sufficiently. You’d think the repetition would be annoying, but because it works on a microlevel it reads more like a poem. Where subjects are recovered on a macro level they are enlivened with a new context so that you’re seeing them in a new light. I’ll try to quote a section that covers the elements I’ve just identified – periscopic narration, attitude, ridiculousness, swirl, repetition:

“My parents had told me that the village was a dangerous place, but I discovered that it was not in the least bit dangerous. I thought nothing of going in and out of all the doors and looking through all the windows. My curiosity knew no bounds. My brother never accompanied me on my expeditions. He’s been down to the village again, he would say, and look on shamelessly, not batting an eyelid, as I was punished for my offense. My mother would beat me with a rawhide that she always kept in readiness, and my father would box my ears. I had many whippings, but I cannot remember my brother being whipped or having his ears boxed. I was interested in anything that was different, but my brother was not, I thought, examining the photo of him in his sailboat on the Wolfgangsee. I once told Gambetti that my brother was always an affection seeker, but I never was. I tired to explain what I meant by the term. At mealtimes my brother was always silent and never dared ask a question. I constantly asked questions and was reprimanded by my parents for asking the most impossible questions. I wanted to know everything – no question must remain unanswered. My brother was a slow eater; I always ate hastily, still do. I always walked fast, wanting to reach my destination as soon as possible; my brother had a slow, one might almost say deliberate, gait. As for my handwriting, it was fast and careless and, as I have said, almost illegible, whereas he always wrote in careful, regular hand. When we went to confession he always spent a long time in the confessional, whereas I was in and out in no time. It did not take me long to list the many sins I felt obliged to confess, while he took at least twice as long over the few he had committed.” p44.

Some eighty pages later Bernhard returns to the rivalry between Franz-Josef and his now deceased brother Johannes. This time Franz-Josef is looking at some pictures of his family as he tells Gambetti:

“My brother, unlike me, was a calm person: at Wolfsegg I had always been the restless spirit, but he was the soul of calm. My parents always referred to him as the contented one and to me as the malcontent. If we got in trouble, it was always my fault, never his. The believed his explanations, not mine. If, for example, I lost money that had been entrusted to me for some reason, they refused to believe I had lost it, despite all my asseverations. They preferred to believe that I had pocketed it and only pretended to have lost it, but if my brother said he had lost some money they believed him. If he told them that he had lost his way in the wood, they instantly believed him, but if I told the same story they refused to believe me. I always had to justify myself at great length and in great detail. On one occasion my brother pushed me into the pond at the Children’s Villa. Whether intentionally or not, he pushed me in while passing me at the edge of the pond, where the wall is not wide enough for two people to pass. I had the greatest difficulty keeping my head above water and not going under. I actually thought I was going to drown, and I also thought that my brother might have pushed me in on purpose, not inadvertently out of clumsiness. This thought tormented me as I struggled for dear life in the pond. My brother could not help me without risking his own life. He naturally made many attempts, but failed.” p127

Maybe you have to read the entire book but I found this passage quite funny? I think it’s the language that gives away that the writer is having a laugh. What I like is that the novel isn’t packaged into sections. Bernhard focuses on making each individual scene as vivid as possible and lets one scene flow into the next without regard to how it fits within the overall scheme of the book. You could argue that the pond drowning passage could flow on from the earlier passage on page forty four. But Bernhard is able to reference back to the contrast between him and his brother with just a sentence or two, a topic that had been canvassed over a number of pages beforehand, and then continue on with an event that had come to his mind. This is how our minds work when we stare out the window in a reflective mood. At first we’re going over old ground but then something may come to us that we hadn’t thought of earlier.

As a writer do we then package the same subjects together or write about them as they occur to us? Bernhard could have separated the the book into smaller sections titled Johannes, Mother, Father, Sisters, The Wine Cork Manufacturer and so on, but this would detract from the swirling nature of the prose. The way the characters interlink is masterful. Without giving too much away, the juxtaposition between the values and apparent principles of the characters all coming together for the funeral elucidated such a realistic feeling inside of me that I understood exactly where Franz-Josef was coming from, why he acts the way he does and why he has such an attitude. Imagine having to greet Nazi SS officers at your fathers funeral because they were ‘friends’.