Our Stormproof Medium Seat Pack provides you with all the storage (9x5.5x15cm) you need for your ride in a low-profile, fully waterproof package. It features an expandable, roll-up closure compartment, so you'll never run out of room for the essentials, plus a roll-up closure system that keeps its contents safe and secure. And knowing that you'll be using it as your go-to for inclement weather, we've included a reflective patch at the rear, as well as a clip-mount for a Stix light, in order to increase your visibility to motorists in low-light conditions.