DeeBooper

When I make my bags I go to AC Moore or any hobby store and I buy what painters use to paint on (not a painter so don't know what they are called..maybe canvas?) I can use my rotary cutter to cut them and I can get about 3 or 4 from the size I buy. They are very sturdy and lightweight...love 'em...Forgot to mention that they are very inexpensive also.

piepatch

I have used double layers of plastic canvas, plexiglass and even heavy cardboard, but I now only use a heavy mat board. I always cover it with fabric. I get the heaviest mat board they have in the art department at Hobby Lobby, but it is also available at art supply stores.

reginalovesfabric

plastic canvas here. It's cheap but be sure you anchor with a few stitched on the bottom

suekenyon

I use 2 layers of the plastic needlepoint sheets. I just
cut them to size. Have had no problems with them.

mommafank

I just finished one and used vilene.

rustqlts

...old cutting mats! They can be cut w/scissors, too!

patsyo56721

I have used the plastic canvas.

katlady

I use foam core board purchased at our local dollar store. Cut fabric a bit larger & make a cover to match the lining of the bag.

redpurselady

I use foam board too. Got it at Walmart.

Deborah12687

I use card board and buy the plain plastic table cloth fabric. I then place the card board between the cloth and sew around it for the bottom. I do that because card board if it gets wet doesn't last as long.