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Card Ninja

It’s a common nuisance when running, cycling or going to the gym: carrying both your phone and the contents of your wallet—minus the wallet. The Card Ninja, which combines the two, is an elegant solution. This slim adhesive mini-wallet sticks to almost any phone (or phone case) and can hold on tight to your ID, some credit cards and cash, so you don’t have to worry about where you’re going to stash those things when you’re on the move. $19.95; cardninja.com
—Mark Lebetkin