BikeSmart SaddlePack 1.0 Seat Bag is perfect for carrying your ride essentials, such as a spare tube, tire levers and mini-tool. Plus, it has an expandable compartment for extra storage when you need it. It's durably constructed of nylon with quality zippers and reflective piping for visibility. There's also a sturdy taillight strap (light sold separately). Plus, Velcro straps make it easy to secure the bag to your seat rails and seatpost.