We have an OL. We started it in the Spring and this is the first trip we have had it delivered full of stuff. It was awesome! So much stuff that we didn't have to pack cause it was already here. Friends of ours have 2 of them. They keep an aerobed in one of them.
We are here now and took stuff out for the cruise that we are leaving on tomorrow. The rest of the stuff we put back in the locker and will keep in the car. If your resort has a large enough bell services area, they may keep it for you, while you are on the cruise if you are coming back to a disny resort. OKW has a small area, so we are just keeping it in the car.
I have full size shampoo and conditioner, etc. I have laundry detergent and fabric softener. I have some medicines like tylenol and cough medicine. We even have paper and markers for DD. We bought a pool noodle in the spring and stuck that in there too. We kept our rain ponchos in the locker. We left a bottle of wine and 2 cans of pop in it too.
Whatever you can think of, you can keep in your locker!