The first one I purchased must of been a dud. It would not hold air. I figured it must be a bad one. I have a camping Mattress just like this one I bought from Wal-Mart 7 or 8 years ago and its been everywhere with me. It still works just like it did the day I bought it. Only difference from this one and the one I bought from Wal-Mart is the valve stem is on a different side and it is a different color. They both have Intex printed on the mattress.