The Silca Mattone Grande seat pack is a water-resistant seat bag that attaches to your saddle rails using the BOA(R) Closure System. This 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... ever! The Mattone also features a unique zipper design allowing it to be accessed while on the bike, or to open like a book when removed from the bike. Features: Water-resistant saddle bag Carry up to 3 road tubes or 2 MTB tubes, two CO2, Multi-tool, tire levers, and some extra cash 77 cubic centimeters of internal volume (more than 2x the volume of the original Mattone) Internal divider holds ID, credit cards, or cash while protecting your tube from your multitool High friction Hypalon strap with BOA Closure System YKK Aquaguard zipper keeps the unwanted elements out Specifications: Pack Type: Saddlebag Pack Capacity: 0.77L Mount: Boa Waterproof: Water-Resistant Material: Nylon Dimensions: 5.9 x 3.5 x 2.2" Color: Black Weight: 106g