The OtterBox Waterproof Case 3500 is the perfect size for GPS units, PDAs, small video/digital camerasand for hunters; its excellent for storing ammo. It has the patented ability to keep its contents completely dry even when submerged in water up to 100 feet below the surface. Great for worry-free storage of your valuables when youre boating, fishing, on beach trips, or during any activity that involves water, inclement weather, or rough conditions.