Magellans has a bag for film which allows it to go through Xray without damage! A professional Pho-Jo friend swears by it.
I'm sure Rubrick can kerreckt this info I am about to give if it is inkerreckt, but I've heard that such bags don't work. I trusted my source because it was a camera shop that sells the bags....Why would they turn away a potential sale? yet they did.
So the wisdom I heard on lead-lined bags to protect your film was: Don't bother and don't waste your money. The x-rays in airports are very low-dose (except for the ones they put checked luggage through - hence you should NEVER put your film in your checked luggage, in a lead-lined bag or not) and will not harm film that is below something like 1000 ASA (most amateur shutterbugs shoot either 200 or 400, very rarely as high as 800 and only for specialised pix such as action shots at sports events).
Always take your fillum in your carry-on bag, and don't worry about the x-rays...that's wot I heard. I also heard that if you use a lead-lined bag, airport security types will just bump up the dose on the machine until they can see through it. Now THIS info seemed a tad suspect to me - I thought x-rays couldn't get through lead, period? - but I offer it up as one more possibly erroneous tidbit of info.
It does make sense, though, that airport security types are not going to view lead-lined protective bags kindly - since they wouldn't have any idea what such bags are likely to be "protecting." If I were an airport security type and such a bag came through my machine, I'd make the owner open it so I could be sure it didn't contain a small gun or knife, or plastique or any similar weapon of small-scale destruction.
