So im using 1.16.5 latest version and im a bit clumsy. It happend to me several times to throw out obsidian backpack :C
I suggest to add a new tier in config that would be netherite backpack.
The main idea is to create backpack that wont burn in lava if you accidently throw it away.
Optionally there could be one additional row in backpack, but backpack not burning alone is good enough.
Could be upgraded for 8 netherite scraps and 1 obsidian or 4 netherite ingot, 4 obsidian and 1 glass.