Feature request: Open Backpack from Chest GUI

[Aarschmade]

Is it possible to implement the ability to open the backpack GUI, while having a chest open?
saves a step to move items from Backpack -> inventory -> chest. or vice versa

[KnightCa]

I have the same request. A big limitation is the lack of a easy method to move items from the backpack to a chest. Currently you have to move all items to inventory, then move to chest.. very cumbersume.