Osprey Radial features: Designed with rigors of daily bike commuting in mind, the Radial pack is a fully featured technical backpack with plenty of bike focused benefits and a secure and comfortable fit. Active suspension backpanel uses innovative load lifters to add tension to the harness which adjusts to riding position and keeps the pack stable Airspeed backpanel offers great ventilation and comfort Bike specific features include: Lid-Lock helmet retention, blinker light attachment, reflective accents, and hi-vis raincover Integrated "kickstand" keeps the pack upright and verticle for easy loading and unloading Top zip access to padded laptop sleeve Heat embossed top and side pocket offers easy access to keys, glasses, and phone without scratching valuable items Front organizational pocket Removable hipbelt, adjustable sternum strap with integrated whistle Dimensions: 21” X 13” X 12" Condition: lightly used, some mild signs of wear such as minor stain on shoulder Check out this product video from REI: https://www.rei.com/product/105830/osprey-radial-26-cycling-pack