Originally Posted by kanor

Scientific posters would come into my mind first, but yes art is another possibility.

I have carried ~1m tubes many many times to almost all continents with a lot of airlines, it was never a problem. And it always fit into the overhead bins (sometimes slanted).

OT:
Once entering the USA the security people asked to open the tube for inspection because xraying it was apperently not enough. And a friend of mine even had to explain his scientific thesis to the inspectors to proove that this is really just a harmless plastic tube. Was quite funny