I use Luan in mine..

I found a great tutorial at
http://nicolemdesign.blogspot.com/20...fast2fuse.html

She recommends Peltex or Fast2fuse and shows how to make a base that she sews to the lining before sewing the bag together. I especially like that because before I used different materials in the "pillowcase" manner, but always was losing things underneath them. This eliminates that problem, since it is hidden between the two layers. I have also had corners begin to wear through when I used harder materials.

Her method works great!

Tap Plastic here in california has sheets that look like plastic cardboard. They are easy to cut with an old rotary cutter to what ever size you want. can get about 30 - 40 out of one sheet for only $6.

I use a double layer of fufible "Peltex" and cover it with matching fabric.

I have used all these materials. The bagg E bottoms are just too pricey, I've gone with very stiff cardboard(free) or plastic canvas. I make a sleeve for cardboard ones and stitch in the canvas.
Plywood too heavy, plexiglass-can't cut to size anymore. Hope this helps. I've sold many of my bags, just let the customer know what's in the base.

I have used plastic canvas, especially if I know it will be washed I have used thick poster board also. Don't think it can be washed though.

Posted this not too long ago without searching. What I use for the bottom of my BT and other bags is game boards. I had several games lying around that weren't being used as pieces were lost/missing. They are usually very sturdy, and I can cut them to the size I need. Works great. They are pretty easy to cut with your ruler and rotary cutter if you go over it several times instead of trying to do it in one swoop. My way of recycling. lol

Now that's a brilliant idea! Thank you!

I use the matte board also. I get it when I have a coupon from ACMoore. Then I cut it to the size I need. Each purse requires a different size. I then cover it with fabric and then stitch around it.

now that is a great idea............never thought of that. I have seen so many games sold at yard sales but was never interested in them. This changed the way I search now.................thanks.......