I just returned from a month in NZ and took 35mm casettes and 120 rollfilm. On the way down there I asked for and got hand inspections because I was told by various camera store peeps that if you use the lead bags they crank up the x-ray machine etc etc. So, on the way back having had no x-rays going I decided to test this and just left the film in the lead bags on the upper part of my carry-on luggage. No problemos...the bag went through at the same rate as the others, no crank ups no nothing. So, there are some old wives tales, imho, that have been laid to rest. But I am not sure I feel a whole lot safer as a traveler. Hmmmmm.