Fabric 1.21.1 - 0.16.9
travellers backpack v10.1.3

i left the game , came back after 20 mins the backpack cant be accessed or replaced

leave game , come back , there is a bug

the backpack icon in inventory is gone , i cant see it on my back, i can see my tools i put inside , the backpack can also not be replaced with another backpack

tools displayed bottom right:

Backpack not there , not interactable or usable either

cant equip another backpack as well

https://www.curseforge.com/minecraft/mc-mods/travelers-backpack-fabric/files/5995861

Upgrades update for fabric containing a lot of bug fixes, make backpack backups or empty them before updating - items should transfer but make backup just in case something went wrong