If you travel overseas and pack your phone, you've likely been dinged with ridiculously expensive roaming fees. Pick up a pay-as-you-go SIM card, and you'll be ahead of the game, though such a tiny gizmo can easily be lost in the shuffle. Clothier Nau, based in Portland, Ore., offers a water-resistant 100%-recycled polyester wallet with a dedicated SIM-card slot. The Billfold functions as a normal wallet with six slots for various cards and a semihidden cash sleeve. You can even recycle it when you're done.
Nau Billfold: $35