SILCA Mattone Seat PackNamed after the Italian word for Brick, Mattone is a water resistant, ultra compact seat bag that attaches to the rails using the BOA Closure System. Unique zipper design allows it to be accessed while on the bike, or to open like a book when removed from the bike for easy access. Specifications Exterior Sleek black finish with reflective graphics Interior Hi contrast red material with separate ID, credit card or money flap Interior Volume Holds one