Holds your smart phone, PDA or mp3 player with plenty of room left for cash & credit cards. The Rat Wallet is designed for the technologically savvy. It expands the function of the traditional wallet to cellphone, pager, MP3 player, and PDA carry (fits smaller PDA's such as the Palm 500 / Palm V series), with plenty of space left for cash, coins, and cards. Can be carried independently, worn on the belt, or attached to your Maxpedition backpack as an accessory. Great for professionals on the go.