weird things you wouldn't think of
giant water bottles, or "big gulps"
Never in my life have I been more thirsty then when I was breastfeeding. I started carrying around giant "big gulps" to keep me hydrated, and I had a strong preference for ones with straws because I often had a baby in one hand and didn't have two hands free to open a water bottle. The 32-ounce Bubba Capri Tumbler is my favorite and it comes in lots of nice color combos.
ipad/iphone/kindle/book stand
I consumed a lot of media while I was nursing, and to the point above, found it somewhat difficult when I only had one hand free. This little stand helped me prop up my book or movie or phone so I could more easily use it with one hand, and it's pretty small and convenient, so now I bring it along for flights to prop up my iPad for movies.