Travellers backpack is out for fabric! Also the current backpack mod takes up your chest slot, as well as it's annoying to use for crafting since it doesn't show the crafted item and you have to actually craft it to see if the recipe works 😭. Travellers backpack has lesser slots, is less buggy, and is more convenient to use! For more info, check out:
https://www.curseforge.com/minecraft/mc-mods/travelers-backpack-fabric

fad1471

Incoming in next version