I have tried all the methods over the years, plastic canvas, cardboard, acrylic cut to size at the home improvement centers, etc. but I like foam board ($1 at Dollar Stores) best. It is easy to cut to size, cover with a sleeve and holds up fine in the bottom of my purses. It has a softer feel than the acrylic but still gives a good sturdy bottom. You will love your Bow-tuck. I have made several.