When we ride with Silca's Mattone Grande Pack, we can hold up to 3 road tubes, 2 CO2 cartridges, 2 tire levers, and a multi-tool to ensure we are ready for any trouble that comes our way during a long day of riding. This spacious pack securely attaches to our saddle rails with a wide Hypalon strap that is tightened down by the BOA(R) Closure System.