Thanks for you replies and comments
I'm still trying to figure it all out.
I do my potting work in the garage in inclement weather, but prefer to do large quantity and the bigger containers outside for less chance of spillage etc.
Right now, as the started plants are uppotted and planted out, the small containers are accumulating outside -- most still need to be washed but larger sizes are reused as needed to uppot the smaller ones. I've been trying to bring in the cleaned containers in the garage for those rainy day projects, but almost always, the size container I need is in the wrong location.
I don't dare put any of the containers away in the shed - I keep needing them.
Right now, I'm keeping in the shed two 2 cu ft bags of potting mix and Bumper Crop in the wheel barrel as well as a 5 gal bucket in which I mixed up about 3 gallons of equal parts soaked alfalfa pellets and bran -- part of my potting mix. I trundle the wheel barrow out and mix up 5 gal bucket of potting mix at a time, adding dry rice hulls.
I'm glad. I didn't think to do this in the garage because the unused alfalfa/bran mixture is composting and emitting ammonia odor (in other words, it stinks) until well mixed. I almost gagged when I opened the shed, but once aerated well with a garden fork, the smell subsided to more of a fresh manure smell -- but I lost a lot of nitrogen (and heat) to the air. At least the experience confirmed that the mixture IS a good fertilizing additive.
I have an accumulated pile on the patio that I want to organize, hence my question and request for help and inspiration. I think I WILL start by cleaning a bunch of containers and drying them in the sun today. -- a good place to start. I think I'll hold off on final organization and storage until I finish uppotting and repotting all my tropicals which I still have to finish -- that's always a challenge because they are like molting hermit crabs, each one moving up to the next size container as they become available....