Cards and MBs are in plastic antistatic bags, and into cardboard boxes. RAMs and CPUs are in original packaging (like those small plastic trays) if available, or smaller cardboard boxes, again with antistatic bags. HDDs are in those flimsy plastic packages and again into some cardboard boxes. I don't have much to store actually: 40-50 cards, 5-6 mobos, 8-10 HDDs, a couple of floppy and optical drives, plenty of RAM, 15-20 CPUs, too many adapters and cables, and some other stuff. 2 - 3 shelves in a book case is enough to store them all.

To say the truth, I love my hardware in computer cases and in working condition, rather than in storage..🤣

I just stack them as is in cardboard boxes with covers to keep dust out for HDs' and CDROMs. Laptops are on metal racks, computers that are not in use get stacked up in the basement. Cards get stuffed into plastic storage bins (non staticy kind) some have ESD bags some don't (common stuff).

I use PC cases. Twelve of them are filled to max with hdd, optical drive and all pci / isa / agp slots populated. IDE cables are kept on a big box. but still I have a couple cardbox.