I have a similar underbed storage bag from Ikea and ordered these two to avoid another trip to the store. These are terribly flimsy and have no structural support to the sides, so they won't stand up on their own while you are taking items in and out. They're also made out of "fabric" that appears to be made from paper and is very thin. I'll be returning the one I haven't opened yet and making the trip to Ikea for the similar product that costs the same but is far better made.
These bags hold a lot more than one may think based on the photo. Perfect for storing extra pillows and bedding. Great value as well- hard plastic cost twice as much or more at a brick-and-mortar store. The next time I move, everything under the bed is ready. These bags a secure handles and quality zippers.