I kept the ammo and powder(original containers) in a house closet for some twenty years. It's away from fire, in a darkened place, don't smoke and only I went near it. (the kids never had the run of the whole house)
I've personally used a RCBS partner press. Never reloaded for a large number of firearms; enough to make it a hobby.

Never got around to having a workroom reloading area. My setup is strictly portable. I use an old Black & Decker workmate portable bench. (as the house handyman use it for carpentry work)
I attached a powder base and a press to opposite sides of a 5/4" board. (drilled holes to attach the base and press, permanently, and drilled holes to attach the board, temporarily, to the metal base of the B&D workmate bench.) The rest of the reloading supplies are in their own plastic tool boxes in the shed.

So in storage, the board with the powder base and press is in a small storage closet; the powder is in another house closet; the rest of the reloading equipment is a in tool boxes in another storage area.

On reloading day, I picked a quiet, unused room and put out my reloading equipment and supplies. When I'm finished, they all disappear to their storage areas.