These Aloksaks are fully waterproof to 60 metres and are perfect for protecting your valuables against the elements. They come in a pack of 3 different sizes and are made using the toughest, reusable polythylene. And to further prove their worth, they come approved by the Navy Experimental Diving Unit. Cards, cash, keys, passports, phones, mp3 players.....these handy little bags will protect whatever you choose to store in them.