I work full time, so I send my 5 MO daughter to daycare with pumped milk, and I also freeze whatever I pump that she doesn't eat. I've been using the medela freezer bags, which seem to be acceptable but not stellar. It seems like there's a lot of spillage when I pour the milk into her bottle for daycare, even when I use a funnel. Is there a better brand for freezing breast milk, that pours easier? Or a better way to do it in general?