What is the use of the PUBG tactical backpack?

What is the use of the PUBG tactical backpack?
"Tactical backpacks will be refreshed in all maps and training grounds in normal games and custom games, and the use of tactical backpacks is also supported in sandbox mode. Almost all items can be loaded into tactical backpacks. Extra guns, helmets, body armor , props, etc. can be put into the tactical backpack. Multiple stacked props such as ammunition can also be put into one slot of the tactical backpack. (When storing multiple stacked props, the weight that can be stored in each slot The upper limit is 60.) When putting extra weapons into the tactical backpack, if there are accessories on the weapon, it will be put into the tactical backpack together with the accessories. Players cannot put the tactical backpack into another tactical backpack.