Hand-carry drones through customs overseas

[astroboy]

Not sure where to post this question.

Anyone has any experience hand-carrying (with a backpack) drones to other countries, eg Vietnam or China? Any problems encountered?

Thanks.

PS: Just read this and it's rather sad:
http://www.echinacities.com/china-m...ging-Photography-Drones-In-and-Out-of-Country