You know where your keys are? I can never remember where mine are. I can remember lots of other stuff that's completely useless 98% of the time, but where my keys are is fairly frequently a mystery.
In all seriousness though. Maybe in base inventory screen, you can select on different locations (i.e. back for backpack with sub-groupings for various backpack pockets, waste for belt, each leg for a pocket, etc) to access a different area where things can be stowed. Thus you ought to have quick knowledge for where things are. Then each place has a grid size or weight limitation for that area. Would make accessing items quicker for those who pay attention.
In all seriousness though. Maybe in base inventory screen, you can select on different locations (i.e. back for backpack with sub-groupings for various backpack pockets, waste for belt, each leg for a pocket, etc) to access a different area where things can be stowed. Thus you ought to have quick knowledge for where things are. Then each place has a grid size or weight limitation for that area. Would make accessing items quicker for those who pay attention.