So I recently decided to upgrade from a generic bottle to something a little nicer as I just had to find a solution to the bottle nipple collapsing so easily on me. So I went out and found these Playtex Advanced Ventaire Bottles
Link: Playtex Baby: About Playtex Bottle Systems ? VentAire® Bottle System
and they are awesome. I simply wuv them. They have a vent in the bottom of the bottle so when nursing from it the air it pulled from the back through the vent rather then through the nipple like most bottles thus the nipple never collapses and the air doesn't mix in with the liquid so a little less burping as well. Now they are not the cheapest I mean for three of the bigger ones with the extra wide nipple (my personal preference) was a little under $15 but as far as I am concerned they are worth every penny. I can finally fully enjoy nursing from a bottle. Just thought I might let the community know.