I have three breastfed kids - nursed DD til 2 1/2, Ds1 til he was almost 2 (he quit) and am still nursing Ds2 (though he's only 3 weeks old, so I'm not sure it counts much toward this discussion), but I've never ever pumped. A couple of times I wasn't sure if I'd be gone a bit long, and I've hand expressed a couple ounces, but mostly my kids were on solids a little by the time I left for more than an hour or two, so we filled in with solids in those cases. I happily have no pump, and feel ok about not having a saved up supply in the freezer... Somehow I think there'll be bigger issues than breastmilk if I'm in such an emergency situation as to not be able to nurse. Other things I should be able to see coming and work up a frozen supply, I think.