after many tries at doing this most efficiently- here is my system for avoiding excess bag charges. I pack my aquatica housing and ports in my eagle creek tarmac 25, wrapped up in articles of clothing then placed dead center of my bag with other clothes padding them all around. comes in under 50 lbs. ike ds 125s go in my dive bag , akona under 10 lb bag, also wrapped in clothes. my carry on is the akona pro camera bag with cameras , lenses and all accessories. best camera bag out there. this is secure enough that if I am forced to gate check this bag, I feel good about it... as good as one can me checking cameras.