This compact Backpack holds 11 liters, making the AirFlex11 a full-featured yet sleek and waterproof pack with a convenient roll closure. The Flex-Wire system provides padding, ventilation, and carrying comfort. A adjustable compression cord carries a bike helmet or light jacket. Two outer pockets (not waterproof) offer quick access to space for small items. Two reflectors ensure good visibility in the dark. The AirFlex 11 also features a fixing loop for a rear bike light.