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. This 3500 size is great for cell phones and wallets.