Wanted a lightweight something-or-other to sit on, stand on, etc. Tyvek would work, but I didn't have any.
I *did* have some cheap Joann's ripstop on hand, so sewed some hems in a piece about 2 1/2' x 3'.
Works great. Lightweight, packs down to nothing. Not waterproof I suppose, but underneath my tarp it doesn't really need to be. Could be a bit larger, but it's not bad.
Once I went to bed I put it alongside my hammock to stand on when I got in/out.
Pic from last night's S24O bikepacking trip -