I am learning how to sew and have not yet graduated from stuff sacks yet, mostly because they're still kicking my ass! I've got some cheap wally-world uncoated ripstop, which I've laid out with a square, taped down, cut with a "hot knife" (solder iron), before I even get past step one and fold it in half the thing's gone all wonky on me and nothing is square anymore. I have not had this problem with cotton fabrics
So how do you keep this stuff from shifting?
Thanks.
RED

