Material: 600D polyester. 2 exterior zippered Expo pockets, pockets with rubberized zip (increase in volume by approx. 11 liters). 1 inner mesh pocket. Flattened shape, fits under the saddle. Upper part of the bag with Expo function and additional fastening cord (volume enlargement approx. 1.5 liters. Dimensions: 33x13x18 / 13cm. Total volume: approx. 16 liters.