The Pro RMX2 takes the unique design of the Pro 0 and scales it up to a volume that will hold a 29er tube, two large 25g CO2 Cartridges and a Chuck, patch kit, tire levers, and some coffee money. Lined completely with ¼” #2cross-linked foam the RMX2 will not shake or bounce with the 1.5” hook and loop secured to your seats rails. The oversized hook and loop allowed us to eliminate the seat post strap making the bag perfect for dropper seat posts.