purchased to use as storage space in a small and awkward 100 year old kitchen with no cabinets. I chose this shelving unit because it can be customized and is slim at 13 inches wide. I bought 6 units to build a pantry around the sink (a laundry utility sink for now) that is three shelf units across and tall. I was able to build over the sink and create a dish drying rack and storage for like essentials. On the other end of the system I built the shelf fits a medium microwave. All together I made space for canned foods, dishes, pots, cleaning supplies, snacks, etc. I don't think the manufactures encourage building this shelving system three units high. For this I want to mention that I used rip ties to double secure the units together, secured the shelves to the wall, and am only storing light weight items such as Tupperware and dish towels, etc on the top tier of shelves. and I have a step ladder handed to make it all accessible. This shelving system, because of its versatility, turned my kitchen from a nightmare to functional and even enjoyable room to be in. My use of the units may be unique but no matter what you want to use them for you will be pleased with the quality of materials/sturdiness, how easy it is to put together. Seriously! I only glanced at the instructions and because everything snaps into place you can't mess it up. and, you can unsnap it to take it apart and don't have to worry about losing pieces or remembering how to put it back. super bonus for me is that for under $200 I was able to retrofit my kitchen until I can afford custom cabinets! When I'm done using these in my kitchen, I will purpose them in my laundry room or inside of our closets. So happy with this purchase.