A rugged and simple tank bag that has typical Ortlieb quality construction features welded seams with heavy-duty waterproof material, and top quality hardware and detailing. The design utilizes the roll-end method of closure for total waterproofness. No raincover is needed for this thing. Mounted on a base pad with eight powerful magnets, the bag features a modular ‘stacking’ design which enables the use of two tank bags at once, or just the included map case on the base pad. Quick release buckles for easy adjusting and bag removal. Features a robust waterproof zipper for quick access to contents while mounted. Clever and well built real-world gear that works. Seam welded fabric. Black. 6.3"×13.8"×9.8"/ 850 cu.in.