I think the poly tarps and hammocks would be fine even after the temp changes a car sees. The one place I can't seem to trust is my outdoor shed. It's just your basic ~10x14' wood shed with asphalt shingle roofing. Some ventilation. The fabric on the camp chairs I have went to crap after a couple years...dry, brittle, tearing and even delaminating on the bottom. I want to think it would be less extreme in a car that isn't outside 24/7, and maybe less damp/dry swings since a car is sealed up pretty well?
The only thing I ruined in a car was my kayak spray skirt. It is seam sealed exactly like a dry bag or rain jacket (similar nylon material too). While the tape looks fine, there are tiny cracks all along the middle where the thread is touching. It leaves like a sieve now. I'm pretty sure that's due to temp changes/expanding/contracting. That's why you should never store "gear you care about" in an attic.
OK I was all over the place there. One last thing that is important to me is price. I put together a BOB and EDC type kit years ago and used them....ZERO times. So the last thing you want to do is tie up money in gear that may never be used. But sounds like you already know that.
The grand trunk ultralight hammock is cheap, good quality and actually quite comfortable in a pinch.
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