Ideas for MYOG projects with thinner polyester etc~

heyhey I have an old tent and a lot of old rain coats to cut up. I’ve mostly been making stem bags and trail wallets which need a stiffer fabric (nylon / ecopak)

I’ve been making a lot of popcorn bag pouches with all my polyester. It’s also great for lining for other projects, stem bag clinch etc.

What projects can I work on that don’t need stiffer fabrics?