Christine,
Hope all goes well for your delivery!
Jacelyn,
Actually the cooler bags, despite the name, can also keep things warm/cool ie will basically maintain similar temp when u put it into the bag (I have heated up porridge for my #1 and keep it warm in the Medela cooler bag before). But better to keep bm chilled rather than warm coz warm will be more susceptible to bacteria etc. I also use the methods as suggested by Joey and Ryan_leroy above, depending on whether I bring out freshly expressed or chilled bm.