Considering that backpack has its own straps for back-mounting it should not take up slot in the back, allowing 1 slot open for more convenient use of bow or quiver or big weapon. For small trade off, it will require hold-grab to take backpack out when there is another equipment in back slot.
This has already been suggested in a part of a large backpack idea and on it’s own, though I can’t find the ladder right now.
Not exactly the same thing. This is based on existing mechanics without many extra slots which the devs won’t seem to approve.
Oh no, I’m not talking about the slots on the backpack, but the idea in the post that you would have two slots on your back, one that you can place a backpack on, and another saved for anything that normally goes on the back, besides a backpack.