"Oh great, another backpack mod" - you though while rolling your eyes.
Well yes, it is. Nothing to add here. Just a plain old simple mod adding more "balanced" early game storage than most simple backpack mods.
YABM adds a 9 slot Backpack crafted by surrounding a chest with 8 leather pieces.
Inspired by INMIS [FABRIC/FORGE] (probably the best vanilla friendly upgradable backpack mod):
https://www.curseforge.com/minecraft/mc-mods/inmis
You should just use Backpacked [FORGE] instead of my mod:
https://www.curseforge.com/minecraft/mc-mods/backpacked
Feel free to use it in your modpack or upload its edits.
Suggestions and contributions are welcome.