create some kind of container system, to allow for a rental item to have other parts included with it, as part of a kit.
Say you have an item like a 4x4 KinoFlo light. That light comes with 4 bulbs & spares, plus has other bulb and accessory options. It would be great if you could build containers, which are the kit, that include all of the parts, like bulbs, which could also be inventoried on their own.
This already kinda happens. See these posts: