Inventory: slot system
You have a number of inventory slots equal to your Strength score
Most items take up one slot.
Smaller items can stack (typically up to 3 or 5 to a slot, whatever makes sense) and tiny things like pieces of paper or whatever take up zero slots.
Larger items like heavy and/or two-handed weapons take up 2 slots
Light armor takes up 0, medium armor 1, heavy armor 2 slots
100 coins per slot