Migrate from As You Wish
I bought a yard of vinyl at the local Hancock Fabrics store for $4.99. It was more than enough for the 8 pouches. I used foamcore as a "shell", then glued the vinyl onto it with a good fabric glue that sets in about 15 seconds (not much room for error!). The flaps seal with Velcro. For the amount that I spent on them, I'm happy!