My husband & I are about to embark on an epic adventure that starts with about 23 hours of airplane time. We have all sorts of things to keep us occupied, but I know the batteries for the gadgets will likely die before we can re-charge (essentially no layovers). So I want to bring along a multi-device battery charger; one of those fancy gadgets you charge up on it's own & it can re-charge any USB or miniUSB device. Anybody have experience with those in their carry-on bags going thru airport check-ins? I'm hoping these things are popular enough with travelers now that screeners know what they are, but I certainly can see how it might be viewed as a "suspicious" device.