Strong and streamlined, the Ortlieb Back-Roller Plus Panniers-Pair provides practical storage for those who prefer the convenience of a roll-top closure system. The tough-as-nails Cordura construction delivers waterproof, dustproof, and abrasion-resistant protection for some of your more demanding rides, while the detachable shoulder strap offers transport options when staying on the bike is not an option. This durable pannier uses a QL2. 1 mounting system to quickly and easily attach to bike racks with tube diameters of up to 16mm via self-closing hooks, and also includes special inserts to reduce the hook size for tube diameters of 8mm, 10mm, and 12mm. Plus, 3M Scotchlite reflectors boost your visibility to motorists when your ride goes after dark.