Yes, you can bring a poster tube on a plane as part of your carry-on luggage. Just make sure it fits within the airline's size restrictions for carry-on items and that it can be easily screened by security.
Yes. I have carrried one in my carryon and checked luggage for international and national flights.
Yes, you can bring Dramamine in your carry-on luggage on a plane.
Yes, you can bring a mirror in your carry-on luggage on a plane.
Yes, you can bring a pin on a plane in your carry-on luggage.
No, you cannot bring a screwdriver in your carry-on luggage on a plane.
Yes, you can bring a straightener in your carry-on luggage on a plane.
No, you cannot bring acetone in your carry-on luggage on a plane.
Yes, you can bring brownies on a plane in your carry-on luggage.
Yes, you can bring rice in your carry-on luggage on a plane.
Yes, you can bring condoms in your carry-on luggage on a plane.
Yes, you can bring creatine in your carry-on luggage on a plane.
Yes, you can bring chalk in your carry-on luggage on a plane.