The side bars have a flimsy lock system. I didn’t realize at first, you need to slide them into position all the way. Otherwise the sides start to collapse. They seems to be better since I fully engaged them, my mistake. But I would use a zip tie to make it more sturdy. Especially if your going to put something heavier on top. Otherwise is seems to be a decent product. Has cardboard shelves instead of that material type that doesn’t hold weight after a few uses, so this is better. I did find a possibly sturdier product, but for twice the money. Overall I would say it suits my needs.