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, zippered 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. Features: Saddle Mount offers secure attachment to the SWAT™ mounts on Specialized saddles. Optional strap for use with non-Specialized saddles. Roll-up closure for ultimate flexibility of what you can carry and fully waterproof construction. Reflective patch on back that also allows for a Stix light to be clipped on securely with the fabric clip. Dimensions (cm): 9 x 5.5 x 15