I bought a deluxe queen mattress from Intel That specifically says on the box that it will not sag in the middle. I am went from Wisconsin to Louisiana and Texas on a 3 week camping trip. I gave the mattress 10 days to stay inflated. I figured first three days might deflate a little bit from stretching.I The mattress never did stay inflated throughout the night usually around 2 AM and then definitely at 6 AM when I woke up, I would have to re-inflate The mattress. So I went out and bought a twin size intel mattress to use for the rest of my trip that didn’t stay inflated either. So after about four days that I went out and bought a Coleman mattress which I use for the last 12 days of my trip and it worked perfectly firmly inflated. Now I returned home and I tried to go get my $75 back but I can’t get a refund or a store credit they will only exchange it for another one of their crappy mattress. DONT buy Intel air mattresses, unless you like sleeping on the ground!