This is the RD-54 Rucksack/Load Bearing System commonly used by Soviet/Russian Airborne Forces, this is a Flora Variant. The condition of these are brand new without any wear, straight from storage.
The Rough capacity of the backpack is 15kgs, it also includes a shovel pouch, a magazine for 2x 7.62 or 5.45 Magazines and 2x Grenade pouches that can be attached with a belt of your choice.
The go-to choice for load carriage for several decades of Soviet/Russian Paratroopers.
