The eBack gear rack bag is specially designed for commuters or travelers riding with a laptop (up to 15.6"); the compartment is securely padded for all kinds of riding whether on an e-bike or a conventional bike. A spare battery (up to 40 cm) or water bottle can be packed in the large main compartment. In addition, there's room for everything you need on the road or for work documents, some food, a change of clothes. A mesh pocket organizes charging cables and other small items. The easy-access front pocket offers great options for organization. The bag attaches securely on the right or left of your gear rack with the QMR 2.0 system. The hooks can be easily adjusted with user-friendly dials The bike bag can be locked directly to the QMR hook using a U-lock (such as the TSA lock). The gear rack bag is freestanding thanks to the stiffened side panels. Delivery includes: 1 bag that can be attached to your gear rack on the left or the right. A detachable shoulder strap, reflective elements, and a rain cover round out the features. The gear rack bag is made with eco-friendly, water repellent Eco Finish without the use of fluorocarbons (PFC) The VAUDE Green Shape label stands for environmentally-friendly, functional products made from sustainable materials.