Cammie's Wearable Backpacks 2 has Just Released for 1.17.1! With an All New Backpack GUI, Some Much-Needed Quality of Life Changes, and More! Now available on CurseForge & Modrinth! (Download In Comments) :
Backpacked - Minecraft Mods - CurseForge
More Backpacks [Forestry Addon] - Minecraft Mods - CurseForge