When you reach a certain point where you can no longer carry extra weight around comfortably, I think it would be interesting to see a backpack appear to show that the player is struggling with more than they can carry.
You can have a backpack on any character just by adding it at any stage IG by typing /c backpack backpack1 etc.. So this would be redundant. I think the fact a character is moving at a snails pace would contribute towards the fact they are overburdened.
cute, i like it