Sit-upons we made out of 12" X 18" plastic bubble mailers and duct tape. We stuffed them with plastic grocery bags. The bubble mailers were about $2 each and for 13 of them we went through almost $40 in duct tape. Which is a lot of money we didn't know what we were getting into. :) We took them with us to Girl Scout Camp and they worked great!
Sit-upons made out of 12" X 18" plastic bubble mailers and duct tape.
We used picnic table cloths. We turned them wrong side out (so you can see the fuzzy part), and sewed them almost all the way around with the sewing machine. Then we flipped them so the waterproof side is out, and finished by sewing up the hole. No added padding. They fold up small, and hold up great.
Sit Upon from a Pastic Bag
How to make a sit upon - a girl scout tradition!