GO-TUBE Go Tubes are designed to be portable and can be conveniently carried, attached nearly anywhere and in any position. Use to store small items that you would like to protect from damage, loss, or unauthorised access. It protects the contents from being crushed or ruined by liquids, though its primary function as a security device is delivered through concealed use. Go Tubes secure sensitive and valuable items by relocating them from the usual storage locations; to a safer, hidden location. Quite simply, an item that cannot be found, cannot be taken. Ideal for emergency money, mini flash drives, maps, documents, geocache, glow sticks, matches sewing kit, spare batteries (2 x AA or 4 x CR123) and other small items. The design has remained unchanged since 2006: Simple Design Lightweight 22g Airtight Waterproof/Mildew-Proof/Sand and Dust-Proof Silent Operation 100% non-metallic Length without end caps 82.5mm (3.25 inches) External Diameter 20mm Internal Diameter 17mm (5/8 inch)