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I picked up one of these from Cabelas last year and had it when I packed in. One night it got down in the 20's and I used this over my sleeping bag and it worked incredible.
I've used one of those SOL escape bivies as part of a sleep system before as a trial. I use a hammock and I figured that it could potentially have a dual purpose if I could use it as my insulation underneath me (this was before I used an under quilt and was using a bulky sleeping mat. I was hoping to replace the need for carrying the mat.
my theory was that if the bivy was designed to keep people alive then it should keep my back warm when laid under me. It ultimately was a total ffailure and I had to revert back to the mat fairly early into the evening.
what it taught me was that when it comesto sstaying warm at night it is more important to bring something that works than bringing something just because it is light! It also made me re evaluate the ultimate function of these emergency bivies, I think that they have a value to potentially keep a lost bushwalker ALIVE through a night but they would be most exceptionally uncomfortable through the night.
The particular night that I did my experiment was cold AND raining and I remember thinking at the time that I doubted any chance of survival if I had been relying on just the emergency bivy.
Just some food for thought.
BCrob you can always send your EE quilt and have them throw in extra down and make it a 20 degree .. . I did that with mine and it came back as new (but now 20 degree lol) .
cheers
what it taught me was that when it comes to staying warm at night it is more important to bring something that works than bringing something just because it is light!