I do the same thing. My slotted bag has a little pocket in each slot. You can drop the weight in that pocket and then put the decoy in the slot. It keeps the weight from scratching the decoy.
I do this for my mallard spread. I have a dozen mallard floaters on Texas rig. I also have a dozen GHG mallard shells. I put a floater inside a shell, belly to belly, and then drop them both in the slot. That way the decoys don't scratch each other and I get two dozen decoys in one 12 slot bag. It work like a charm and they are three years old, in perfect condition.
To hunt this spot we have to walk about 300 yards. Not too far but it is PITA. We hollar man down quite a bit. So the less gear we carry the better. This spread comes from one 12 slot bag for me and one for my brother.