Are you saying that your
batteries where actually confiscated because they weren't in a lipo bag?!?
I've never heard of that happening -- I own the bags but never used them because they look scary metallic and covered with hazard warnings. I just cover the metal contacts with gaffers tape and put each
battery in a small zip lock. The official FAA guidelines don't even mention
battery bags -- just says to take precautions to avoid short circuit and accidental start up.
What exactly happened to you? What country? Any details appreciated