To buy: $11; amazon.com. Another bonus? They’re only $11 (making them just over $5 apiece), and require no assembly whatsoever. To put up these dividers, all you have to do is slide them over your shelves—et voila. The clamp on the bottom of the dividers will hold them steadily in place on shelves that are up to 0.875 inches thick, and they’re available in two height options so you can easily grab the taller version to keep bigger piles of clothing and linens in order. To buy: $12; amazon.com.