Knit or crochet with plastic bags

I haven’t tried this yet, but it looks like a good idea.

Or you could use cassette tape.

neato! wonder how sturdy they’d be as hammocks.

a whole bunch would make a snug sleeping place. just mind the fire & ventilation shafts.

I sort of get shivers down my spine imagining the horrendous squeaking sound that knitted cassette tape tape might make. . . especially in a hammock situation where it gets slowly stretched. . .aaaaaaaaaggggh!

One could then iron the result between layers of cloth to make a very strong tarp.