This is a great bag, the membrain work very well when the bags is closed. I use it in the middle of January at -10F and i''''m very impressed. the only thing that i''''m angry, why Sd use velcro in the collar??? The velcro in general purpose is very easy to use, but in my neck is not a good idea. This bags is perfect for bacpacking and mountaineering because you have just to remove the top section in warm night. The packability is good, waterproof and light.Good choice for me.

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