Describe the bug
Without any other mods installed, the bigger backpacks' GUIs are bigger than what can fit in the screen (especially with the netherite backpack)

The only workaround is reducing your GUI scale.

To Reproduce
Steps to reproduce the behavior:

1. Open the bigger backpacks
2. Check that part of the menu can't fit in the screen

Expected behavior
A backpack menu with the correct scaling according to the one defined in the Minecraft's settings

Screenshots

Versions
sophisticatedbackpacks-1.16.5-3.15.15.607
forge-1.16.5-36.2.35

This is solved in 1.18+ with scrollable inventory and I am not going to port that back to 1.16. You will need to use different scaling there.