This versatile and removable external case supplies space for crucial items like tools and a first-aid kit. It features a roll-top seal and can be easily and quickly connected to the pannier using a convenient hook-on mechanism. Alternatively, you can wear this compact bag on your belt. The size S option, complete with a reflector, is compatible with all ORTLIEB bike panniers (except for Back-Roller City, Gravel-Pack, Downtown Two, Velo-Shopper, and Office-Bag), while the size L model is specifically designed for larger backpacks.