Carry capacity: Tool slots
Carry capacity is limited by available generic tool slots, or by item type (e.g. only only one heavy and one light). Not including clothing/armor or similar passive things.
Alternate name: Item type
The first video game about Carry capacity: Tool slots was released on January 25, 1992.
This also covers cases where you can carry only as much as your hands can hold, no putting stuff on belt or pockets or using straps to keep them around, just your hands.
This is somewhat vague tag, unfortunately, so before using review the already tagged games for examples.
Commonly, but not exclusively, these have no inventory.
The limit is commonly 1 to 5, with most games falling to the 2-3 range with 4 coming next.