XLAB's Mini Bag is a small seat bag perfect for carrying the essentials. Can fit a tube, tire levers, inflator, patch kit, and two 16-gram CO2 cartridges. Small enough to tuck under your saddle or inside your Super Wing or Carbon Wing rear carrier. It's made from tough Cordura, is easily attached with the hook-and-loop straps, and it works with round and aero seatposts.