The Outer Pocket is a handy & versatile little additional bag that can be attached to any Ortlieb pannier allowing extra space for essentials such as tolls or a first aid kit. It features a waterproof roll top closure & can be quickly attached to the pannier with a simple hook on system. The bag can be carried on a belt too & has a 3M reflector for added visibility. Dimensions: H 20cm x W 12cm x D 7.5cm Capacity: 1.8 Ltr Weight: 105g