The backpack or inventory capacity in "Stalker 2: Heart of Chernobyl" is very important in the game. If you want to increase the backpack inventory capacity, you can use artifacts. They can increase your maximum Bearing weight, but at the cost of reduced radiation resistance.
How to increase backpack inventory capacity in STALKER 2: Heart of Chernobyl
This game is quite restrictive in terms of inventory, and there aren't many ways to increase storage space. There are two main ways to achieve this:
As you explore, you can acquire artifacts that increase your maximum carry capacity at the cost of lowering your radiation resistance. These artifacts are usually marked with words such as "low, medium, and high". The "medium" weight increase can bring your maximum weight to 86 kilograms.
In addition, you can find a prop called "Hercules", which allows you to increase the weight by 20 kilograms in 300 seconds. This item is usually found in areas of the game that require you to carry heavy objects.