Ortlieb Trunk Bag Rack Bag – 10L Each Petrol. The waterproof Ortlieb Trunk Bag with TIZIP closure features the Ortlieb Rack-Lock system it fits almost any standard rack. With 12 liters volume and a shoulder strap it is the right bag for longer touring or shopping. An additional outer pocket (not waterproof) and an inner pocket with snap hook help organizing small items like cell phone wallet and keys.