I specifically bought this bag for summer camping. It is light and stuffs in the bottom of my pack. I have used it down to 45 degrees and found no problems. It works fine for what I bought it for.

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Mountain Hardware bags

This bag is light alright! I wouldn't use it for anything but warm summer camping. If you even think that the temp. may get anywhere near 45 deg. I would suggest a more substantial bag. Also, the zipper slips quite a bit throughout the night. Overall - it's an expensive sheet.

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