This is a genuine US Army (may have been issued to either US or ROK troops in South Korea) medium ALICE pack.
Comes with No frame, Shoulder Straps or waist belt

Field Pack (medium) – The field pack is made of water repellent treated nylon duck and webbing, spacer fabric, and metal hardware. It can be used with or without the LC-1 Field Pack Frame. The main compartment closes by means of a drawstring secured by a plastic cord clamp. A radio pocket is located against the back on the inside. The size of the pack may be decreased for smaller loads by means of three para-cord ties, stitched to the inside bottom of the pack, and three metal D-rings located directly below the internal radio pocket. Three pockets on the outside, with strap and buckle adjustable closures and with snap fasteners for quick access, are provided for miscellaneous items. The top flap has a pocket with a hook and pile fastener tape sealed closure. Equipment hangers are located above each outside pocket and on each side. Drainage eyelets are provided in the bottom of the main compartment and the outside pockets. An envelope pocket is located at the top, back of the pack and padded with spacer cloth, into which the field pack frame is inserted when the field pack is used on the field pack frame. Buckles and straps at each side near the bottom are used for anchoring the field pack to the field pack frame. Two rectangular wire loops located at the top back of the field pack and D rings on each side at the bottom of the field pack are used to provide shoulder strap attachment when the field pack is carried without the field pack frame. A waterproof bag is supplied for the main compartment and each of the three outside pockets for keeping equipment dry.

NSN 8465-01-019-9102

Please note: as these are military surplus there may be some colour, quality and style variation to the image shown.