This bag is a lifesaver for mothers pumping milk at work. When I get to the office in the morning, I put the two freezer packs in the freezer in the break room. As I pump milk throughout the day, I store the containers in the bag in the shared refrigerator in the break room. The bag looks just like a lunch bag, so nobody has to know what I'm storing in the refrigerator. At the end of the day, I slip the (now frozen) freezer packs into the bag and take the whole thing home with me. The freezer packs keep the milk cold for hours, which is a really nice benefit. As any new mother can tell you, when you walk into the house at the end of a long day of work, the baby is often crying and hungry. I usually dump everything by the back door and only get around to moving the milk into the refrigerator hours later. This bag has really reduced the stress associated with pumping and transporting milk every day.