Standard IKEA Expedit bookshelf, 4x2 configuration in white. These sturdy shelves have generously-sized compartments that fit book,s records, motorcycle helmets, and pretty much anything else you throw at them. IKEA no longer makes these, which is unfortunate because they are versatile and go with any interior.
I have two of these in the 4x2 size, and one in the 2x2 size, all in good condition. You can stand them up vertically or lay them on their side and use the top surface to hold more stuff.