Well it finally looks like the weather is about to change and the sun is going to show its face.......so you are going to need a beach bag. I use Heat and Bond fusible fleece to give the bag some stability, which works out cheaper in the long run if you buy in bulk.
This can also be used to give others bags, make-up bags, wash bags and lots more a bit of body.
And for more stability that will give your bag more body and help it stand I use Bosal which is a fusible foam stabiliser. Bosal is more expensive but well worth the extra cost if you want a sturdier bag.
Both of these products are fused to your chosen fabric with an iron. One thing I have learned is to over iron the fusible as this tends to cause creasing.