Quote Originally Posted by NikoSperi
... Keep your film in it, and pass it in the hand luggage machine. One of two things will happen: it comes out the other end and you walk away (99% of the time), or the operator sees a lead bag and is then required by his regulations to hand check it. ...
For what it's worth (YMMV), this has been my experience, too. Last year we did Germany via England. I only got a hand inspection after the Xray on the return trip through Gatwick. The lady took every lens cap off and looked through the lenses, but didn't open the film bag. :rolleyes:

Since I already own 3 of those bags of various sizes, I'll probably keep using them.