The Sedici T2 Lazio Tour Tank Bag is constructed from 2320 hypercore plus fabric and features a main pocket with organizer, side pockets, window pocket and an included rain cover. The bag's capacity is 15 Liters expandable to 20 Liters.; 2320D hypercore plus construction Padded and reflective sides Reflective piping and trim Transparent window pocket (4.5" x 8") Removable magnetic mounts (strap base sold separately) Capacity: 15 Liters (20 Liters expanded) Dimensions: 14' L x 11" W x 11" D (14.5" D expanded)