The outer design has zipper pockets for convenient storage of items such as headphones. The main bag contains an external hung system, which can hung items such as keychains and glasses. The rear side is designed with reflective pattern to ensure safer riding at night. The inner bag is waterproof and can store electronic products or items that are not easily waterproof.Equipped with a rain cover, it is not afraid of getting the contents of the bag on rainy days. Specifications: Color: black, grey (optional) Capacity: 20L+20L Material: polyester bag size: 350 310 160mm / 13.8 12.2 6.3in Install size 500 350 310mm / 19.7 13.8 12.2in Item weight: 1750g / 3.9lb Package size: 400 340 90mm / 15.8 13.4 3.5in Package weight: 1800g / 4.0lb Packing List: 1 Cycling Bag 1 Rain Cover.