SeaSucker has discovered that this case is ideal for boaters. By attaching rubber suctions cups on the back of the case, the T3500 can be attached practically anywhere on a boat. It’s an ideal clear plastic case for holding a boating license, sunglasses and a wallet. You can definitely keep the water out. It is our first size for custom medical kits, used primarily by campers. The rugged construction will protect the items inside. It does have locking capabilities. Cubed foam is also available for this case size.