Quite serviceable. The product pictures make it look like the containers are sturdy, but all the sides are actually soft cloth. This means that if you wanted some structure to your storage, you're out of luck. That being said, they can hold quite a large amount of clothing. I'm not sure about them being described as "Underbed" - they are relatively tall, so they didn't fit under my low bed, but I guess they could fit under some. They would work as general storage containers for a closet though.