If you're looking for the real deal, don't look any further than the MOLLE II Large Rucksack.
This system is the current Field Pack Set issued to the US Army. This system consists of a single main rucksack that can be divided internally into two compartments to better organize the user's load, MOLLE Frame, Enhanced Shoulder Strap Assembly, Waist Belt and two Sustainment Pouches.
The pack allows for access through the top and bottom of the main ruck, and has webbing across the front and sides for attachment of MOLLE compatible pockets. The ultimate backpack for all your field operations, camping, hiking, hunting, and all other outdoor activity needs.
Genuine USGI surplus. Varying conditions but all in working order.