The US Military has used this Genuine Issue Rucksack backpack to carry and distribute the weight of their equipment evenly. It is large enough to hold 75L or 4,600 Cubic Inches. They are constructed of durable, water-resistant Nylon Cordura. These rucksacks are resistant enough to carry a decent amount of weight. It features a 4" x 3" ID window, top drawstring access and bottom zip access, and a top flap for additional equipment security; the reverse side of the flap features a mesh compartment with zipper closure.

• Constructed of durable, water-resistant Nylon Cordura
• Front claymore pocket and inner attachment ring for Radio Pocket
• Transparent plastic 4″ x 3″ ID panel
• Dimensions 23" x 25" x 8”
• 75L capacity (4,600 cubic inches)
• Top drawstring access, bottom zip access
• The top flap has a mesh compartment with a zipper closure
• It can be attached to a frame or be used as a standalone pack
• Genuine US Military Issue
• NSN: 8465-01-524-5285
• Made in USA 

This rucksack is highly versatile; it can be attached to a frame or be used as a standalone pack. The option is yours!