I like to use the magnetic purse closures. They are similar to a very large snap, but are magnetic instead. They fasten on by inserting 2 prongs through the fabric (you must reinforce it first), and bending the prongs over a kind of a washer-like metal piece on the inside. Joann's carries them and if you buy them with a half off coupon, the price isn't too bad for a package of them.