I pump at work; my office is about 1.5 hours away on my homeward-bound trip due to traffic.
I am only in the office once a week, and have found the expressed milk travels better if I freeze it immediately after pumping ... and since it is only needed once per week when DD is with my SIL, it stays in my freezer. (I nurse DD when I work from home and on the weekends.)
Currently, I've got a sizeable stash so it's available in a pinch or if DH and I go out and need to leave DD with other folks.
As I pump directly into the pump-and-save bags from Medela, there's no loss of resources or space, though I do have to check the supply of bags! (I think I am running low & tomorrow is my in-office day.)
==========================================
Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle