My setup is a bivy and tarp, and requires trekking poles if you plan to pitch above treeline.
I use a Titanium Goat Raven XL Bivy with the full net hood option. It's larger than thier Ptarmigan Bivy and is cut big for winter bags, but works perfect for a 3 season bag if you like a little more space. 7.9 oz
http://www.titaniumgoat.com/Bivy.html
I use a custom Oware Tarp cut to 8'X8', and it's the perfect amount of space for me and my gear. With seam sealing and my guylines (Kelty Triptease) attached, it's 14 oz
http://www.owareusa.com/
For my sleeping bag, I use a 35* Western Mountaineering Caribou MF long, that weighs 23.6 oz. It's a very conservativley rated bag. I've slept soundly in it on a night that got down to 19 degrees in the Beartooth Wilderness of MT with only a light baselayer on.
http://www.westernmountaineering.co...ndex.cfm?section=Products&page=Sleeping Bags&cat=Microfiber Series&ContentId=23
My pad is a Therma Rest neoair medium that weighs 12.6 oz. I used it on the above 19* night and had no issues at all.
http://www.cascadedesigns.com/therm-a-rest/mattresses/fast-and-light/neoair/product
For stakes, I use 8 Vargo Titanium, and they weigh 2.3 oz
All total this shelter system weighs 26.2 oz, and my sleep system weighs 36.2 oz. I don't count the weight of my trekking poles as they're used throughout the day and will be with me regardless, but for those that want to know they are Black Diamond Contour Ellipticals and weight 20 oz together.
This system has kept me warm and dry for a total of 16 nights (13 above treeline) in the harsh Beartooth Wilderness of Montana. I've been hailed on multiple times, snowed on twice, and experienced gale force winds multiple times as well and this combination has remained solid. I see no reason for a tent, and when it's bad outside, being able to look out and see the view at all times is a heck of a lot better than staring at a tent wall.
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