Plano's Guide Series™ waterproof cases are the best protection on the water. Cam-action latches and a Dri-Loc^® O-ring seal provide an airtight, waterproof environment so your valuables can travel with you worry-free. Even if they go overboard, contents stay safe in one meter of water for up to 30 minutes. The largest of the Guide Series waterproof line, the 3700 size can hold bulkier items like camera lenses, first aid kits, cell phones, wallets and more.