Shed stuff seems to obey the universal gas law. It expands to occupy whatever volume is available.
I've gradually acquired more stuff over the years, and so far I've utterly failed at getting rid of anything. So the only solution for me is to increase shed space by extending or building another shed.
I've got my main 6m x 9m garage where the bikes and car live. There's also a trailer, workbench, lathe, storage shelves, storage cabinets, tools, more tools and a bunch of miscellaneous stuff in there. I also have a 3m x 3m garden shed where the mower, brush cutter, chainsaw and general garden and digging stuff lives. I also store flammable stuff like fuel cans and paint in there. Not long ago I bought a 20 ft shipping container to expand storage space, but it now has some of my ex-partner's furniture in it. Now I'm rebuilding a ramshackle, draughty, leaky old weatherboard firewood storage shed and turning it into a dry and warm general purpose work area. I'll probably put my table saw and other wood-working stuff in there. While it's practically a re-build, I'm calling it "repairs and maintenance" so I don't need a building permit from the local council.