Meaning Brick, in Italian, the Mattone is Silcas award winning seat bag powered by the BOA® Closure System. With the Mattone Grande, Silca have now created abigger brickwith 77cm3 of internal volume, more than 2x the volume of the original Mattone.The Mattone Grande is capable of holding up to 3 road tubes along with 2 CO2 cartridges, 2 tire levers and a multi-tool. It can also easily hold up to two 29x2.5 MTB tubes along with CO2, levers and Multi-tool.The Mattone Grande is ideal for those long adventure rides or races where you must be prepared for everything. Similar to the original Mattone, a high friction Hypalon strap with BOA® Closure completes the package. Making more than 15x the power of Velcro®, the BOA® Closure uses a ratcheting mechanism that will not creep or loosen even under the most extreme vibration and impact. This ensures the Mattone Grande will remainhigh and tightunder your saddle until you need to access it... no swinging, swaying, or rattling... ever.K