These were delivered the day that both my sister and i left on separate trips and we were both fighting over who got to use the new bottles because they are so cooli am so glad i i chose these bottles i feel like no matter what containers ive used in the past if i have flown with them they have leaked but these stood up to the rough airline handling with no problemsi will be purchasing another set so that there is no more fighting over who gets to use the good bottles what i like about these is that it does a great job at keeping the liquids and fluids inside the silicone container