Lone Peak Glacier Peak Pannier Plus Backpack System (Single Unit) Constructed in the USA from water-resistant 1000 D heavy duty nylon and Coverlight tarpaulin patches Technical backpack easily converts to pannier system that attaches to all bike rack systems Loc-On pannnier rack clips, compression straps, and bungee attachment is secure on all bike racks Includes 15 x 10 laptop sleeve, mesh padded back, adjustable shoulder straps, 4 external pockets Dimensions: 12 L x 5 W (unfilled) x 18 H; Volume 1000 cu in; Weight 1lb 14 oz.