Although panniers are, in many ways, practical and a comfortable choice, there are still situations in which a backpack is the only way to go. Ortlieb developed this backpack to be just the perfect choice for bike commuters. The materials are, in traditional Ortlieb fashion, 100% waterproof and tough, all seams are welded tight and all together it's easy to guess this pack will stand up well to the rigors of daily use. As is typical for the Urban series, the outer fabric of this backpack is stylishly textured, with the designation "PS55C." The features have not been compromised for appearance: the material is 100% waterproof. - 100% waterproof without a need for rain covers - Padded computer pocket inside, measurements 39 x 27 x 2.5 cm, suits max. 15.4" computers - Ergonomic shoulder straps - Back panel padding has generous grooves for air circulation - A non-waterproof small pocket with zipper - Attaching points for a LED light (light not included) and a U-lock (U-lock not included)