I liked the fit of the BG AIO better than the OS so I got a few of them to try out. The fit was awesome on my son! I really liked the BG AIO with an extra BG MF insert for night time BUT I was just NOT good at washing the MF. It was so hard to get clean smelling. I was about to sell all my AIO's and kept looking for something to work. One night I thought to take all the MF inserts out of my AIO's so I could put natural fibers in the pocket. It worked great! I stuff them with hemp now and don't have any leaks at night and don't have to worry about stinky MF!