The Ortlieb Back Roller City Pair gives city bikers greater flexibility. They can be used on both sides on front or rear racks or as single pannier. Highly incandescent 3M Scotchlite material reflectors on the panniers\\\" sides give increased safety in traffic. The major advantage: the urban transport containers do not require any mounting. The innovative QL1fixation system is easy to handle and the bags attach to the rack with one click. Key Features Waterproof bike pannier (pair) ideal as starter model QL1 mounting system with straight lower hook rail Sides of PS 490 nylon material, front and back of PD620 material No mounting required (simply adjust the hook distance with allen key no. 3) Ideal for racks with a cross-section up to 16mm Reduction pieces for rack cross-sections 8 and 11mm included Can be used individually (e.g. for shopping, sports, picknick) Highly reflective Scotchlite reflector