The versatile and removable outer pocket offers space for important items like tools, first-aid-kit etc. It features a roll closure and can be easily and quickly fixed to the pannier with a hook-on system. The little bag may also be carried directly on the belt. Size S with reflector is suitable for all ORTLIEB bike panniers (exept of Back-Roller City, Gravel-Pack, Downtown Two, Velo-Shopper and Office-Bag), size L can be used on larger backpacks.