Last year I bought a Miranda-style bag from LeSportSac. It's a nice bag with some convenient pockets, but I find that it's not deep enough for my purposes. It's always overflowing, and as it only has a snap closure, I am often liable to lose something. Also, it has snaps for narrowing the sides a bit, but the snaps are a tad loose, so they unsnap quite easily. Perhaps my penchant for carrying a bottle of water is not suited?
Conclusion: I really need purses that zip close.