Modular steel shelving that mounts to the wall and changes when the room does.
Three components make the system. A hangtrack mounts horizontally into studs. Vertical standards hook onto it, with no screws driven through the uprights. Shelves sit on cantilevered brackets that carry load back into the standards rather than into single anchor points.
Every part comes off and goes back on somewhere else, so adding a shelf this year does not commit the wall to that layout next year. Steel throughout, powder-coated, rated to 75 kg (165 lb) per bracket pair.
Start with a kit or build from individual components. US shipping included.