Okay yan ang ginagawa ko din with my pumped milk at lahat ng nanay friends ko! The bottle storage thing is okay for the fridge during your workday, tapos once you're home and transfer to breastmilk bags for freezing, that's the safe way to do it, your two-hour travel time with ice bricks is perfect, honestly. A few of us actually prefer the breastmilk bags kaya mas tipid sa freezer space din. But I'd double-check with your OB or pediatrician just to be sure about the exact guidelines, especially since storage rules can vary slightly, better safe than sorry with baby's food, diba?