- Total of four compartments: - Main compartment: 18 x 10 x 5 with one zipper and one mesh pocket. - 2nd compartment 15 x 8 x 2 - Front top compartment: 4 x 7 x 2.5 - Front bottom compartment: 10 x 8 x 2.5 - Hydration compatible (hydration bladder not included) - Grommets on all compartments for drainage - VOLUME : 1362 CU IN In the Box Specifications: Size 18 x 10 x 10Color BLACK California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov