The 6L Dry Sacks were designed to fit the Medium sized tank bags, but can be used with any OGIO on bike bag (or any other OGIO bag!) The roll top design and taped seams make this watertight and super protective. The high vis lining makes finding your stored goods a snap. Features: Roll top design, Taped seams for waterproof storage, High vis lining. 15” H x 6.5” W x 4.75” D / CM 38 H x 16.5 W x 12 D 366 Cu.In/6 L, 0.1 Lbs/45 grams, 210D Ripstop Nylon with PU Coating