It really depends on what system you decide on and how many and what size lenses.
I'm a big fan of Think Tank, designed by photographers for photographers. I have used a Shape Shifter Backpack as my primary bag for many years and I have a number of bags to choose from. I use an Airport Security roller bag when I need to bring my big glass.
I shot professional sports for years and put my bags through all the torture tests and they are still in great shape. I haven't visited their web page for years and notice they have really expanded their product line to fit just about any use where when I first bought my bags they primarily targeted professional photographers, and still may. I haven't looked closely, don't need any more bags
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