Most of the time when you realize you’ve left your wallet behind, it’s because you’re reaching to grab cash to pay for something. What follows is that awkward moment where you pat all your pockets and try to string a sentence together. A better option is tossing the Cash Capsule on your key chain and storing some money in it for emergencies. The aluminum Cash Capsule stores one bill (we’d suggest at least dropping a 20 in there) and is waterproof to keep your money from being a soaking wet ball of mess. It’s a simple and handy little device you should probably keep with you.