The TankLock system on the GIVI XS306 TankLock Tank Bag eliminates the need of straps or magnetic limpets, previously used to fasten your tank bag to the bike. Thanks to a small mounting ring attached to the tank cap, the bag can now be attached by simply aligning it to the mounting ring and pressing lightly until you hear the classic click.Equally easy is the removal of the bag; to release it you can just pull the red lever located at the base of your tank bag. The mounting rings depend on the make and model of your motorcycle, and you need to check the compatibility list to establish which ring is for use with your model of motorcycle. Please Note: This tank bag uses the Tanklock fitting system to lock and unlock it from your motorcycles fuel tank. It requires an additional mounting kit. This features a volume of 25 litres, dimensions of230-280 x 330 x 250 mm (height x depth x width) Tanklock system, handle and shoulder-strap (for carrying) removable tablet-holder, map-holder, integrated GPS-holder, cable port, rain cover (fluorescent), waterproof internal compartment to store raincover, waterproof zip, dampness protection, reinforced parts, reflective inserts and this is expandable!