Product: 4-pack 97QTAssembly:The instructions are so easy to follow with pictures and the bins basically come pre-assembled. The bins come folded together so all you have to do is pull the sides up and lock them in place together. It’s rather flexible at this step so it is very easy to get all of the joints lined up. I was skeptical at this point because of how loose and flimsy it felt, but once you place the fixed frame on top, it holds very well. It also comes with wheels, however, I didn’t use them because I placed them on carpet and I don’t plan on moving them. Each bin comes with an individual lid as well so you can use them all separately or all stacked together.Storage:I got the 97QT option so each bin has a great amount of space for storage. I love the height and depth of these because it allows for a variety of sizes of items to fit. It does have a lip on all edges though. I don’t mind it because it helps keep loose items in place. For example, I put a bunch of my cat’s toys in one of the bottom bins and the lip keeps them all from just falling out.Sturdiness and Versatility:The doors are held in place by magnets so they are not loose, but very easy to open and close. The bins are made of plastic and pretty light weight so they’re easy to move around. The locking mechanisms hold pretty well and I was able to assemble them in one place and carry the stack to a different location without feeling like they were going to fall apart. It does only come with only one set of wheels but each bin comes with all of the components so you can use them as single bins or all together in one stack. I obviously did 2 and 2, which I think comes to a nice height. I filled one with all of my cat’s extra toys and supplies, and took a door off of the bottom bin so my cat could have a little bed nook. And the other stack is just filled with snacks. One of my bins came with a cracked corner, but other than that, I really like them for cheap and easy storage.Customer Service:Since one of my bins arrived cracked, I reached out to customer service and got a response almost immediately. These come with a 2 year warranty, but I was expecting it to be a hassle to get the broken one replaced. However, they replied quickly and addressed and fixed my problem all in one email and told me to keep the set I had, while offering me a replacement. The customer service definitely exceeded my expectations and was very pleasant to work with.