Describe the bug
On crafting a backpack and upgrading to iron/gold, the inventory size (27 slots) did not increase. In all documentation/videos I see that it was supposed to increase.

To Reproduce
Steps to reproduce the behavior:

1. Upgrade backpack to iron
2. Open backpack
3. Suffer

Expected behavior
It should have increased in size.

Screenshots
Added

Versions
Forge 43.2.10, MC 1.19.2 with the Valhelsia5 modpack on Survival.

that's exactly how the backpacks are setup in configs in that pack so you will need to report that to pack author if you want that changed