I got a 20F bag years ago for a trip only to find out it didn't have a zipper, and is just a tube. Very light, very warm, no ventilation. The past weekend has taught me that I'm in need of something to keep me warmer than my beloved 40F bag. Instead of buying new, I'm considering adding a zipper to my 20F bag, or maybe even turning into a quilt. (Insulation should be synthetic.)
Has anyone done anything similar? What should I be careful of when starting this project.
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