I did this weekend project a long long time ago, but just recently cleaned out my messy garage, got the Ranger back in and finally took some photos of the project.
I built a pool lift for the toddler swimming pool. This pool is too big to deflate and blow up every other day or even every other week, so we keep it inflated all the time. But we had no place to store it when it was fully inflated. So I built the pool lift.
It has pulleys and a block-and-tackle and you just tie the rope off at the wall anchors. I tried it without the b&t, and it was way too hard to lift. It’s light as a feather with the b&t, though. My wife gets the pool down all the time while I’m at work and puts it back up. When the kids outgrow the toddler pool I can think of all kinds of things that I can store up there.
One word of warning, though: the bottoms of your garage ceiling joists are not designed to hold the weight of heavy objects! Attic joists are designed to carry a heavy roof load only on the topmost spans. The lower spans are only designed for compression or tension.