I'm somewhat bag-illiterate, but I'm thinking it would be really nice to have a convertible bag that can go from day use as a crossbody to evening use as a clutch -- so something with a removable strap. This would mainly be for travel so I can get away with using one bag all the time.

Looks like Hobo has several along these lines:

and Matt and Nat has this one: http://mattandnat.com/shop/col.....-artichoke

Any other ideas? Anyone else find this style useful?