This is a very abstract simple way of calculating how much gear you can carry. Each player gets a 3×5 index card to write what gear they have. They can only carry as much gear as they can write on the the card. Small writing = organized packing. Reason and fiction will keep people from packing halberds and ten foot poles in a satchel. Paper tearing or getting punctured from writing represents the bag breaking. Saddlebags and chests are represented by index cards where you can write on both sides as well as have room for bigger things in the fiction. If your more artsy. You can draw the items on the card and use bigger paper. This method is focused on fun and simplicity rather than technical strategy or realism. It’s worked well for me and my players.
This is a very abstract simple way of calculating how much gear you can carry.