I was thinking of adding how it would be more fun if when wear a bag on your back that it shows, like you see your character wearing a duffel bag on his/her back for example. Makes you feel more like you are carrying things, lets you understand why your character cant run great distances. On this Also id like to add how about a tool belt or such that you can use for smaller items with a weight of 0.5 or less and greatly reduces the weigth, as the rules of relativity states that just cause it doesnt change to the laws of physics it will still feel different to you in your situation like how a big backpack full of books is heavy as hell but you can much easier wear it on your back. Sorry for the crap use of punctuation.