I use the ProTactic BP 450 AW II from Lowe Pro. This just fits into the smaller jet overhead space. I put two Z8 cameras, a 600PF with reversed lens attached, a 100-400 with reverse lens attached, and a 24-120 with reversed lens attached, along with some smaller items, batteries, cards, charger. It weighs 23 lbs. It has a backpack sleeve but when I use that I can hardly pick up the bag as my MacBook Pro adds another almost 4 lbs so I normally pack that in a separate carry on but use the sleeve if I can only have one carry on. I just used it on a regional jet, Calm Air, going to Canada to photograph Polar Bears. On the way back, however, I used the valet service with Calm Air and that turned out fine. On the bush planes they just put everything in the back of the plane so good padding is a must.