Expedition Backpacks (1.18) Add-On

Expedition Backpacks

Once you have your backpack in your inventory, hold the item until some arrows come out.
Once you have the backpack with those arrows, you just have to press the items you want to save.
Once you have saved everything you had to save, just press the item in the backpack again and it will be saved.
If you want to take out the items, just hold the item again until the arrows appear, and then press in another space of your inventory.
To remove all items at once, just equip the backpack in your hand and hold down on any space where there is no interaction and it will release all items.