T.K.
I would pump directly into two bottles. Cheap bottles - with capacity of holding 9 ounces each. I put the flat top on the bottle and then give them to the sitter. It was easier for her - she would put what she needed in the bottle she used to feed him (I used Nuk bottles for feeding and just a cheapo bottle to pump into). I had an extra set so she would have a set of bottles with milk in it and I would have the other set to pump directly into. To me it was less mess - at the end of the day I would take her empty bottles home and wash them - along with my breast pump so it wasn't extra work. Plus I felt like there was a less chance of spillage considering I myself had disasters trying to dump milk from a bag into a bottle. It worked well for us!!