The 1150 cubic inch convertible pannier backpack - or vice versa was designed with serious bike commuters in mind. The roll-top waterproof pannier is built tough enough to withstand the elements in tough commuting climates like Minneapolis and Seattle. The tapered profile works with a variety of racks up to 12MM in tube thickness. Reflective piping and flashy tab keep you visible and safe. Simple, adjustable rack hardware. A convient outer flap pocket for quick access and two generously sized outer pockets. The beauty of this design is that by simply un-hooking the panier flap and swinging it to the opposite side of the bag will reveal the backpack straps. Banjo fans will recognize the two prominent vertical reflective stripes down the flap. With the pannier hooks on the opposite side of the bag, the pack will be super comfortable for long-commutes and walking around off the bike. One of our main guys - Banjo Gene Lew tells us the compact pack is his favorite of the commuter backpacks with just enough space to fill all his gear for a day's worth of client meetings. Fits both men and women and at under $80, it's a tremendous value.