I haven't carried film recently but when I have I've always requested a hand inspection. They say below ASA 800 is ok but the effect is cumulative. 4 hits (quite reasonable for an international connection) and you're down to safe only below ASA 200. Also, what happens if they back things up to have a better look? Anything could be fried in one hit that way.

I've got some clear plastic tubes to pack film in. While they can hold 5 rolls I pack 4 so they are loose--tip them and you can see everything. (The end caps aren't clear.) They are reasonably rugged and watertight--much better protection than a ziplock.

The only time it added more than 1 minute was the first time--before I used the tubes--when one inspector checked each can. We had shot 40 rolls. The tubes draw an explosive swab, that's it. In China they don't even get that, just a quick eyeball.