RD-54 one of the most legendar backpacks. Firstly it was created for Airborne VDV divisions in 1954 year, but it was so popular, that even KGB units use this backpack in Afghanistan. Modified versions was used by Soviet MVD, Russian Troops in Chechnya and it's still in use in Russian Army and Special Force.
Backpack paratrooper RD-54.
RD-54 (backpack paratrooper sample 1954) — backpack, taken into service in the VDV, the Soviet Union, designed to house and transport items combat calculations paratroopers as during a parachute drop, and in field and combat conditions