Another idea in use at Nottinghack -
Standard sized boxes…
https://guide.nottinghack.org.uk/storage.html
https://wiki.nottinghack.org.uk/wiki/Members_Storage
https://wiki.nottinghack.org.uk/wiki/Members_Storage_Downstairs
Now they likely have more space than us to devote to storage - but standard sized boxes you buy that fit into standard shelved makes a lot of sense…