Waterproof. Crushproof. OtterBox. The OtterBox 3000 Series Case, and in particular this extra large 3500 version is perfect for protecting your valuables from all of the elements, whatever they may be. The OtterBox 3500 provides water-tight protective storage for your cellular device, electronics, radios, wallets, and anything other valuables. It even floats! The OtterBox is a patented drybox designed to handle full submersions up to 100 feet.Other products from A4C