The backpack capacity in "Stalker 2: Heart of Chernobyl" has an upper limit, which is 80KG. It is enough under normal circumstances, but 80KG will not be enough when you collect more good things. , and if you want to carry more things, you can kill an NPC first.
How to carry more stuff in STALKER 2: Heart of Chernobyl
If you want to carry more stuff in the game, you can use corpses as portable loot containers
If you really want to get creative, you can use the corpses of human enemies as portable containers for loot. Here's what you need to do:
Take all the weapons, ammo, and items you looted in an area.
Press the "F" key to open a dead NPC's backpack and move all unnecessary items there.
Hold the "F" key while hovering the mouse over the NPC's body to lift it up.
You can only walk with a corpse. However, this method allows you to carry a large amount of loot without being overly hindered, which would otherwise prevent you from being fully mobile.