This 18L bike backpack is specially designed for bicycle lovers and walkers. With ergonomic design, this backpack give you more comfortable feeling. And made of high-quality and safe material, it is durable for long-time use. It will surely contribute to your fantastic outdoor experience. Features: 18L cycling backpack, made of ultralight water-resistant and tear-resistant nylon fabric. Special hole design for water bag (NOT included). Adjustable shoulder strap, chest strap and waist strap to fit your need. Mesh and poriferous EVA design on the back for maximum breathability and comfort. Reflective strips for safe riding at night. Mesh cover to hold your helmet. Rain cover to be used in heavy rain. Detachable pouch for store your cellphone. Suitable for outdoor activities like cycling, camping, mountaineering and hiking, etc. Specifications: Color: Blue / Red / Green / Yellow (optional) Material: Nylon Item size: Approx. 49 * 25 * 18cm / 19.3 * 9.8 * 7.1in Item weight: Approx. 700g / 1.54lb Notes: Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Please allow 1-3cm (0.4-1.2") differences due to manual measurement, thanks. Package List: 1 * Backpack 1 * Rain Cover (Water Bag is Not Included ! ! !)