In just seconds this stainless steel quick release system attaches to the tubular frames for the ATLAS aluminium cases. No extra adapters or parts are needed, everything is included. It can also be adjusted to fit most 18mm diameter tube frames on the market, such as the OEM BMW frames. Roll top with a capacity from 35L extendable up to 45L with magnetic buckles for quick opening, a large waterproof zipped pocket on the front and internally; removable reinforced bottom plate.