Thanks so much you two for the detailed feedback. Very cool, and helps me a lot.
I got a brainstorm a while ago about a having a solid tarp shelter set up without a bivy for certain times of the year. As some of you know, I am a huge fan of the tarp/bivy combo, but because I do section hikes every month of the year, there is a significant portion of the year where the bivy is not really needed. When it's colder temps, there are fewer or no bugs. And in cooler temps, I'll be using a warmer sleeping bag and have warmer clothing, so the small warmth bump of a bivy becomes redundant or negligible.
Okay, but what about protection from precipitation? Going to need a bigger tarp. My go-to set up for summer to early fall is a smaller tarp (Golite poncho/tarp), so the bivy is good for rain spray along with the other benefits of the bivy.
So I decided on a 6×9 tarp, which is bigger than my 8 ft 8 in x 4 ft 10 in poncho/tarp. It's a bit tight, but adequate under my poncho/tarp, so my new 6×9 tarp will be luxurious by comparison. But a lot of people will claim that 6×9 is still too small to use without a bivy in cases of heavy rain/snow and wind. However after using my poncho/tarp for some time now, I have really grown to like it as rain gear. Great coverage, keeps me very dry, no need for pack cover, stealth color, condensation very low due to natural ventilation, material slides off brush and branches, etc. Great piece of gear, and I like it so much I plan on using it as part of my rain gear year round. Plus it's around as much or lower weight than a lot of rain jackets at 200g. Perhaps you see where this is going?
I can use two smaller tarps together. Crazy I know. But check it out:
No precipitation or trail shelter – cowboy camping or poncho/tarp can be set up as a wind blocker (lean-to in the woods or makeshift 4th wall to trail shelter). And if neither tarp is set up, one or both can be used as an addition to my pillow or other improvisations.
Light precipitation and weak wind – set up 6×9 tarp in A frame or lean-to, use poncho/tarp to cover backpack and gear as a huge rain/snow cover anywhere I want.
Moderate precipitation and weak wind or light precipitation with strong wind – set up 6×9 tarp in A frame, hang poncho/tarp on one end as makeshift door, which would also still be big enough to stash backpack and gear under to free up space under 6×9 tarp.
Moderate to heavy precipitation and strong wind – set up 6×9 tarp in bunkered down A frame, pitch poncho/tarp on one end as large door/vestibule, hang rain pants as small makeshift door on the other end.
The next complication is what material to go with. A 6x9ft silnylon tarp from what I have been able to figure out is around 8.5-9.5oz / 240-270g. There are also certain drawbacks to silnylon aside from weight over Cuben. Misting, for example–which is not a big deal or not an issue at all if you use a bivy. Getting a tight pitch and not having to re-adjust, especially with it getting wet, high winds, etc. Plus the tear strength is not as good as most types of Cuben, plus silnylon is perhaps not as easy to repair in the field as Cuben if damaged (which you can fix up well with duct tape or Cuben repair tape). Cuben is of course more expensive, sure, but that's a whole other discussion. Right now I can afford Cuben, so I emailed Joe at Zpacks to make me a custom 6×9 tarp after many emails.
Side note: Joe continues to be very helpful and extremely patient. I even needed special shipping instructions, plus I was an idiot and goofed up the size I wanted in my metric to inches/feet conversion, and was able to make a last-minute change after I had already paid. Thanks again Joe!
Ah, but Cuben is not as good with abrasion. However shelters don't really get as much abrasion, but it's a fair point. But you know what? Durability has been on my mind a lot as of late. Granted, I have owned/own several pieces of Cuben fiber gear, and had very little issues with them. Non-taped Cuben stuff sacks with seams coming apart (but fixed with duct tape) have been the biggest issue, and in fairness I am very careful with my gear and especially so with Cuben shelters.
So I decided I wanted to have a tarp that is VERY tough and durable. Something that I could maybe pass down to my kids one day that would survive many years of regular use. And yet still be pretty light weight–lower weight than silnylon.
The answer was to get my 6×9 tarp in 1.0 Cuben in the cool black color (more like dark gray, good stealth shade). And of course this type of Cuben has higher Spectra thread count and a double thick polyester membrane than the standard .51 Cuben used for shelters at Zpacks. 1.0 Cuben is, after all, used for tent floors and ground covers at Zpacks. For this perhaps some of you might think I'm crazy, as I noted earlier. But I think the numbers as far as weight are not bad, and I think this shelter set up offers a lot of flexibility and excellent protection from the elements. Here's the set up:
6×9 1.0 Cuben tarp – ~8oz / ~230g (still waiting on the tarp for exact weight, this is an estimate)
Guy lines – 40g
8 Ti stakes and sack – 50g
Ground cover (SOL trimmed space blanket) – 43g
Total of 12.8oz / 363g. Pretty good as far as shelter goes, and this includes guy lines and two extra stakes for poncho/tarp for bunker mode. I don't include the weight of the poncho/tarp because I'd count it more as rain gear, and would likely be used more as rain gear. But even including the poncho/tarp, total would be 19.9oz / 563g–still pretty light as far as shelters go, especially one with as much coverage and flexibility as this set up. Plus, because the rest of my gear list for 3 and 4 season conditions is so dialed in and pretty light, I see this as a small amount of luxury weight that I know I won't even notice on in my pack compared to slightly lighter options.
Anyhow, that's the thought behind what will soon be my updated 3 and 4 season shelter set up. Thanks again for the feedback so that I can compare and contrast with. If .7 and .6 Cuben have stood the test of time and thru-hikes, the 1.0 stuff should last me a pretty long time.