Ogio Street Bag-Tb2 21L Tail BagOgio Street Bag Tb2 21L Tail Bag The TB2 is a 21L Tail Bag with a 3 expansion joint that allows the bag to expand and store up to 28L of volume. The Molded EVA with Carbon Fiber PU film provides structure and support while providing water resistance from the elements. The unique design is low profile and provides an internal storage pocket, waterproof rolltop liner and carry strap. The RAM EZY Mount partnership with OGIO created a patent pending