Waterproof and compact, the Mattone Seat Pack is an all-in-one bike bag with an innovative and functional design which we like for long trips and short commutes. This is the perfect size to carry a spare tube CO2 multi-tool and any other essentials. Accessible zipper allows riders to reach into the bag while cycling so we can keep pedaling. The Mattone Seat Pack attaches to the seat rails using the BOA fastener system which allows for precise adjustment.