I'm not a native English so I'll try to explain it as best as I can.
When you have a Jerrycan inside your backpack, and you log off/login the game, somehow, your stamina get reduced the double as it was before you logged off. This happened to me first with a field backpack, then again with a utility backpack. I had to change those backpacks as their became too heavy. The second time, it seems that their weight got swapped, the utility backpack reduced my stamina like if I were carrying Jerrycan, but If I carry the Jerrycan, it does not reduce my stamina as it should.
Pre conditions.
-Make sure you have an empty Jerrycan
-Try not to have other items in the backpack
Steps.
- Put the jerrycan into the backpack
- Log off the game
- Login back to game
Actual.
Stamina get reduced twice, if you throw the backpack away, your stamina goes back to normal.