The Office-Bag is mounted onto all standard racks with a max. diameter of 16mm. The QL2 rail is fixed diagonally and can be rotated to the left or right for increased heel clearance during pedalling. For changing the rail from the left to the right side, you simply remove the outer screws of the bar, rotate the rail, and fix the screws again. The lower anchoring hook serves for securing the bag, and keeps it in place. Please store the shoulder strap prior to biking. Further details: _organizer in A4 (legal size) format with cell phone sleeve, key ring and numerous pockets _edge protection at lower rear corners _bottom feet _handle _reflectors on left and right side