Arvano Bike Backpack Small Mountain Biking Backpack, And Snow Bicycle. Imported Nylon lining Zipper closure 18" shoulder drop Compact Bike Backpack: Measures 18" (45 cm) x 8.6" (21.8 cm) x 2" (5 cm). Weighs 1.1 lb. Two-way zipper. Hydration System, fits a maximum 2.0L/70 oz hydration bladder. NOTE: water reservoir is NOT INCLUDED. Comfortable fit: A slim cycling backpack. It's thin and lightweight making it easy to carry. Adjustable shoulder, chest, and waist straps to ensure a stable for the perfect fit, so the pack will not bounce while mountain biking. Design for Riding: Ergonomic design for maximum agility and comfort. The padded back and shoulder straps will keep your back dry. Reflective strips improve visibility when riding at night. This bag designed specifically for road bike/ mtb/ other outdoor activities. Headphone Line Output: On the front there is a small compartment with a zipper, which offers space for a cell phone. The output hole used for headphone line. Must Equipment for Outdoor Sports: Bicycle riding, snowboarding, skiing, day hiking, music festival etc. Perfect gift for men, women and teens.