aka all hiking/ backpacking gear for a world tour can easily fit into a single backpack or fill a trailer.
Photography, 1 decent camera is really enough.
A single bike is actually fairly small. Start getting into road bikes, touring bikes, etc and they start taking up a lot of space.
DIY can take endless space, but you can get far with a single tool box. 'extra' is often more about saving time than really necessary.
PS: I good rule of thumb is if you have not used it in 2 years it's wasting space. But, IMO even better is if you have used it less than 3 times in a year it's fluff.