A couple years ago we went to Alaska from Florida and back. We were maxed out on weight so we went to extreme measures to reduce weight. The mattress we had was about 50 lbs so we went to an air mattress at about 15lbs. Actually THEY were fairly comfortable. First one Walmart, cannot remember the brand but inexpensive. First one held air about 2-3 days, second one the same. Next to REI, held air about three days, second one the same, also comfortable. The other thing to be aware of is elevation change and air pressure. I know some have had good luck with air mattresses but no more for us.