i'v flown alot , but not lately, and i always use a bag, that i can wear across my body, i need water to take med, with so i take a empty bottle and fill it at a water fountain,, i got mine from QVc. [am i allowed to say that; it has a expandable zipper to let it be bigger , and it has alot of room in it, i even wore in on me, and put the seat belt over it, it would never leave my sight, i still use it all the time, i don't trust back packs, they can be opened to easy from somebody behind you!!!