Anyone use the bottles w/ bags?

I bought the bottle that uses those bags prior to going to Maui thinking that they would be great for the plane (disposable, right?).  And, a family friend suggested them as she used them with her kids and said it made them less gassy.  So, I gave them a shot.  I don't think I am using them right :/

When I put her formula in there, am I supposed to somehow sqeeze all the air out?  Or is that it.  There is just air in there like a regular bottle.  Does this make sense?  HELP.  I don't know how to use these bottles!  hehe

[Jules31981]

I usually push the drop in up from the bottom until the milk is in the nipple that way there is less air for them to gulp. Be careful I have shot people with milk. OOOPPPSSS!!!

[ovaz129]

hahah... okay... that's what i thought, but then the second she pulls the bottle away from her lips the bag fills back up with air so i wasn't totally sure if i was using them correctly!  thanks jules :)

[justice6920]

I used them too when noah was first born.... he really didnt like the nipple to much so we didnt continue using them BUT I  did use them ALOT with my first and the only difference I think is that its just the convenience of having the drop ins and just tossing them..... I think its pretty much the same as far as other bottles go on the gas factor - or less air.....