John wrote, "Personally, I have been experimenting with
light/ultra-light camping
using just a 10x12 siltarp and a piece of 6'x8' TYVEK. "

Flyingmonk wrote:
Reminds me of my younger years playing camping in the woods near our
house, we used trashbags cut open and tape.

I sort of do that now.
In my survival bag I carry two of the heavy-duty 55-gal (body) trash bags.
They can be used as sleeping bags, tarps or bivy sacks, or ponchos.
Plus any other use you may require.