Silca Mattone 74L Seat Bag Silca Mattone seat packs use the power of BOAA(R) to keep all your spares in a compact, rattle free pack. A high friction Hypalon strap with BOAA(R) Closure completes the package. Making more than 15x the power of VelcroA(R), the BOAA(R) Closure uses a ratcheting mechanism that will not creep or loosen even under the most extreme vibration and impact. This ensures the Mattone will remain &';high and tight&'; under your saddle until you need to access it. no swinging, swaying, or rattling. BOAA(R) Closure System YKK Waterproof Zipper Hypalon strap for security 0.74L Capacity Internal dimensions 150mm x 90mm x 55mm Holds 3 tubes, 2 CO2, regulator, tire levers, and multitool