For those looking to carry a bit more, the Large Seat Bag is designed with an expandable zip below to allow more room when needed on the bike. Large enough to hold two tubes, multi tool, energy bar, and other essentials. Slim profile designed to fit under bike seat Expandable zipper for additional storage Hook and loop attachment for seat post and seat rails Slim profile designed to fit under bike seat Expandable zipper for additional storage 15693-001-OS