PCs have a number of item slots equal to their Constitution defense. Most items, including spellbooks, potions, a day’s rations, light weapons, tools and so on take up 1 slot, but particularly heavy or bulky items like armor or medium to heavy weapons may take up more slots. Groups of small, identical items may be bundled into the same slot, at the referee’s discretion. 100 coins can fit in a slot. As a general guideline, a slot holds around 5 pounds of weight. In a system that relies so heavily on the six abilities, it’s important for each of them to play an important role, to discourage dump stats. Non-magical characters tend to dump the mental abilities, for example, so I increased their usefulness.
Designer's Note: Using item slots makes encumbrance simple enough that players will be willing to track it. Slots are also the key to character customization, as a PC’s gear helps determine who they are. Raising Constitution, therefore, will probably be a priority for most characters.