Have a inventory sorting mod but it does not work on the backpack. Anyway to add a sorting button in the backpack inventory?

Not sure how difficult that might be, but probably not. Trying to keep it "simple" so easy to support and update.

If you want lots of features, might check out Inmis: https://www.curseforge.com/minecraft/mc-mods/inmis

Coming from Inmis. I actually like the simplicity of this mod so I understand where you're coming from I'll just live without it. Thank you!

I will not be moving forward with this, I do not want to complicate my code further.