BikeSmart's SaddlePack 3.0 Seat Bag is perfect for carrying your ride essentials, such as a spare tube, tire levers and mini-tool with plenty of room to spare for extra supplies, like your wallet, cellphone and more. 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.