disposable bottles

[skgnome]

I'm flying with a 5 month old on a trasatlantic flight (18hrs). I do not want to fly with 6 bottles on my carry on and a friend told me about disposable bottles or some bags she saw once that work like bottle liners (i.e. bag goes in bottle so you just need one bottle)
Has anyone used them before? What made are they? where can I get them?
I'm using avent bottles at the moment, baby doesn't likes tomme tippe

I found it was no bther to us normal bottles....and a dispenser. We also took the can of formula....when we changed flights, we cleaned the bottles and also sterilized with sterilizing fluid. You would need bottles for when you got to your destination I suppose? And a carry on bag for thebaby is allowable I believe.