The waterproof outer pocket eg for tools first aid kit bottle purse etc can be mounted to any ortlieb pannier or to any other bagfast attachment and removal is guaranteed the loop on the reverse side allows you to wear the outer pocket on your belt or to attach it to strapsthe outer pocket in size small is suitable for panniers and small backpacksthe outer pocket comes as a single bag and includes the mounting rails a punching tool and a templatereliable roll closurereflectorbelt loops