I have 40 more rows on the cuff of one sock, and half a foot, the heel, and the cuff of a different sock. I don't need to take more than these two socks with me... I'm not a fast knitter, that's plenty of knitting, and the idea that I might run out in the 48 hours I'll be away from the stash is ludicrous. I don't need an "emergency" skein of yarn. I really, really don't.
So why do I keep trying to pack one?