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Just bought a roll of Tyvek (paper like unwoven fabric)
This was for some cheap prototype but I'll also use it to make some bags and if it handles well I want to try making a cheap bivybag out of it.
Something that could protect me and my sleeping bag against dew in the morning or the odd rain out in summer or spring
The stuff is super light and metallized so it would reflect my own heat and keep me cosy.
Currently hesitating between a sewn construction or a glued one.