Hellobee Boards

It depends how much milk you pump.. For example, If you pump ~15 oz., I would bring 4-6 5 oz., bottles and combine as you go. It is worth it to have an extra set of pump parts.. You will thank yourself later. A large Tupperware that fits all of your rinsed pump parts in the fridge is helpful, so you don't need to wash parts throughout the day. I always transport milk in a little cooler with ice packs. It may be a short drive, but you never know what is going to happen and throwing out milk sucks!

When I worked I would leave an extra set of pump parts, 2 bottles and several storage bags at work in case of emergencies. For everyday I brought pump parts, 4 5-oz medela bottles (they actually fit up to 7oz) and a cooler with ice pack. I pumped about 20oz a day so I would use bottles 1&2, then bottles 3&4, on my third pump I would combine the cooled milk and reuse the bottles. You're not suppose to pump into cooled milk or combine different temperature milks. Between pumps I put the rinsed parts in a gallon ziplock, then into a non-see through bag to store in the fridge. I worked in a most male company so I was weirded out by them seeing my horns. I had a long commute, almost 2 hours each way and my milk was always fine in the cooler in my purse.

@Pink Champagne: that's the kind of bag I have too. It's great !

I bring 6 bottles (5oz) size. I use two per session. I pump three times. I have about 12 bottles total and two sets of pump parts. I leave one set at home.

Putting pump parts in the fridge between use is ideal. I use a cooler with ice pack for transport.

I also leave a pump at work.

So I bring TWO 9-oz bottles (I have the Avent Twin Electric) to work with me. I pump twice and store in the mini-fridge in the Mother's Room between sessions. I pump directly into the same bottles morning and afternoon. I also store the pump parts that touch milk in the mini-fridge with my bottles.

I have a cooler for transporting the milk home. Once home, I use the same bottles for Xander's bottles for the next day and just use a another bottle to make up his third bottle. Then his bottles that got used that day get washed for me to take to work the next day.

I have 9 bottles, but I use 8 consistently and it goes like this:

4 bottles for Xander (he drinks 3, 4th gets sent to daycare the next day, the other 3 get washed)
2 bottles get used in the morning before work - I pump, combine into one and store in fridge, 2nd bottle gets washed
2 bottles go to work with me - I pump into both and then once home, these 2 bottles plus the one from this morning make up the 3 bottles Xander needs for the next day.

ETA: I have a tote bag that fits my pump & parts, pumping bra, and a book. The cooler I carry separately. It's a little square cooler that fits 4 bottles OR 2 bottles + my 2 pump parts.

@Bookworm: you don't have to wash them in between pumpings

@Bookworm: Less washing and it cuts down on bacteria growth. If you have access to a microwave I've used those quick steam bags to sterilize sometimes.

Oh, and I forgot to list hands-free pumping bra!