This is a Allen Backpack known as the Intercept Tactical, model 10858.
The Intercept Tactical Pack is a 2500 cubic inch capacity hydration compatible bag with internal organizer compartments" multiple external accessory pockets" an external MOLLE web system" and rugged Endura fabric construction. The pack also has compression straps" padded shoulder straps with an adjustable sternum strap" and side carry handles. Dimensions: 18.5" x 16" x 10".
Features:
Endura Fabric
Padded Shoulder Straps
Adjustable Sternum Strap