In general, I like the Idea of modularity. However, I would not plan on carrying an opaque, sealed container of survival supplies & tool past airport screeners. I would expect it to be opened. Then I would expect it to trigger intrusive, accusatory, & dilatory questioning by security. I like Jet's idea of distributing the items all over one's person, & carry on clothing pockets & bags. I would also avoid carrying on anything with a plain, open, dedicated survival purpose. For instance, no matter how desirable an O2 bag might be, I would expect it to be prohibitively provocative.<br><br>John