Re: Gerber/Evenflo bottles and PIS
The Medela lids will fit. I bought some of the Gerber bottles and they did screw into the adaptor for the PISA... and I'm pretty sure I put lids on them. I just pumped into bottles while I was at work and then sent them with her to the babysitter's house for the next day. You could even just put the nipple and ring on top that came with the bottle if you were going to use it pretty soon... although then it might not fit so well in the little carrying bag.
Lilah 10/08 nursed 25 months
Beatrix 01/11 nursed 30 months