I'm trying to find a backpack that I can stick a body and a few lenses in that also fits under the seat in front of me on an airplane. I have been looking all weekend and can't find one. I already have a ThinkTank Airport International v2.0 roller bag that goes in the overhead bins but once I add my 300mm 2.8 in I will have to take a body out and a few lenses to get everything else in. Does anyone know of a bag that could do this? Would also like to be able to put my Macbook Pro in it as well.