I don't have a "perfect" backpack - out and about I use a Lowepro tactic aw 350 (mavic, 5 batteries, sony a6000 + 18-105, 55-210, Samyang 12mm, RX100 and spare camera batteries, powerbank, etc) when for going on the plane I use the FlyMore bag and another case to fit just the lenses and body in...