If you have used a double size, please let me know. I thought I read SOMEWHERE on here that someone used a double sized air mattress at POP. If possible, I KNOW it would be a tight fit, but it could be just put up right before bedtime and put away early morning. I'm going to be buying an air mattress so I'd prefer to get a double than a single. I did a "search" but can't find the post. I'm not very good using the search feature!