I think there should be a weight allowance based on strength (and if the Strength attribute is removed, then maybe a perk)
if there were backpacks, they should not be magic, meaning they have a limit and should be shown on the character's back.
if there were backpacks, they should not be magic, meaning they have a limit and should be shown on the character's back.
It might be fun/funny if the PC could use more than three bags, at an agility cost per extra bag, and have them pile up on the PC, but I doubt it would be worth the technical trouble.
One thing though... I would hope that strength limit was not the only limit in place. A strong warrior might be able to lift seven halberds, but running around with them loose in the arms is all but impossible; and bundling them up makes them impossible to fight with. IMO the inventory system should account for awkward objects. The Witcher did a pretty decent job with this I thought.