Or similar modular storage shelves. I grew up with the older model of the IKEA HEJNE (the new version looks slightly less bulky/sturdy) everywhere in the house, since we moved a lot, and I'm feeling nostalgic for it in a corner of the house where we can't find anything with fixed shelves that works well.
As tall as possible (up to 8 feet), at least 4 (preferably 6) legs and a suitable number of shelves.