You know what annoys me with the containers/backpacks method. That i can not hotbar an item put in the container.
Actually i can, but it's unusable in practice, because at the first inventory action, like sending an item to your mate it disappears.
Not sure if it's a bug or intended.
On the other hand items sent to the person with the container will be put automatically into that container if there is a stack of the items present there already, which is great. Also items put in the container, like shovels, hammers etc. are also directly used from there.
So why not allow to hotbar a consumable item from the container?