Mattone, named after the Italian word for brick, is a waterproof, ultra-compact seat bag that attaches to the rails using the BOA closure system. The unique zipper design allows for access while it is on the bike or can be opened like a book when removed from the bike for easy access. Mattone is designed for the cyclist who wants to carry a spare tube, CO2, a multi-tool, and some cash in a discreet, waterproof package. The internal divider provides space for an ID, credit card, or cash while protecting the tube from your multi-tool.