I'll be traveling from LA to Berlin, Zurich, and then back to LA and I was curious if y'all could tell me about the restrictions/regulations of traveling with gear. I'm trying to put together a small camera package that can be put in to the overhead compartment, I know there's some business with lithium ion batteries so that's definitely a concern. Also, any recommendations for cameras of the 4K variety that are compact would be amazing. Thank you in advance!