Professional guides are on the move, hunting, scouting, making sure their clients are in the birds. They need a bag that is portable to hold the essentials only but with enough room to do the job. The main compartment of the expandable Guides Bag is 650 cubic inches but it has the capability to expand another 150 inches.DuraMax fabricDimensions: 13L x 5W x 10DSliding FrictionLok shoulder padAdjustable shoulder strap with metal snap hook closureFold-over storm flap & Velcro closurePadded carry handleSeam-sealed interior dry bagZippered mesh pocket under flapQuick-release bucklesZippered expanderExpandable front pocket