Kate Bosworth has been wearing her JewelMint metal envelope bag ($60) for a while now — here she is showing off the gold version back in January — but finally the world can get in on it with JewelMint's new boutique collection launch. You buy the purse separately, then have fun picking out which strap you want. In this photo of Kate running errands in LA in an Isabel Marant dress and wedges, she's wearing the sea drop chain ($30) with the silver envelope bag. But you can also choose a simple chain strap or a chunkier one, too. Sign into your free JewelMint account and start perusing away.