Flying domestic (US) has never been an issue. Internationally is a PITA. I use a Tamrac roller case (forget the exact one), which holds at least 2 bodies, batteries, cards, etc., and 4-6 lenses, along with my laptop, iPod and headphones. Last trip it tipped the scales at 18kg for my lone carryon
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I just explain to them what's in it, and why I cannot check it, and they've always been pretty understanding, although you've gotta sweet-talk them a bit sometimes.



