I too have a Pelican 1550 for a Contax MF system; I'm about to replace the worn-out Pick-N-Pluck with either the Pelican dividers or with the LowePro OmniTrekker bag designed to fit in it.

I'd still be leery of checking this thing, because these days the Transportation Safety folks will cut the locks off to inspect it. I know there are TSA-friendly locks, but then the bag is, well, unlocked.

I don't mean to impugn the integrity of anyone at TSA, but I have a hard time entrusting $10k+ worth of equipment unlocked out of my sight.