Hi all, I would like to buy a Lowepro Backpack for my gear. I have a Canon 50D, a 50ml prime, a 17-85 ml and a 100-400 ml lens. I was looking at the Computrecker or the Fastpack 350. I like the look of the Fastpack 350 due to the easy access to the camera compartment. My question is will the 100-400 ml lens fit in it, attached to the camera. Does anybody use one with similar gear ? It also needs to be of a size freindly to be used as carry on luggage on a aircraft. Thanks for any help/experiences, Jeff