I'm heading into the office for the first time since I had the baby, and I'm bringing with me 3 bags - 1) Medela PISA 2) Insulated lunchbox (the lining freezes so it keeps everything nice and cool all day long), which I'll also use to store my pumped milk during work hours, and 3) My laptop bag, which also doubles as a purse since I just toss my wallet and keys in there too. What about you?