Mostly help with pain and focus. I don't struggle too much with those things, but I do a little bit. If the labor goes for a while (my labors seem to be significantly shorter each time than the previous, but you never know), I know I will need something to keep me going without wanting to give up or without caving to an epidural (though, I am having the hubby remind me that the first one didn't work as planned, and I'd rather be up and around, anyway).
One thing I noticed (midwife gave me a suggested list of things to bring), is that they listed olive oil or KY lubricant for perenium/crowning. Silly question, but would it have to be an unopened bottle of olive oil? I mean, I'm sure I can get a small bottle, but I wasn't thinking of that. My last midwife (though it was a freestanding birth center birth) had oils on hand for pereneal massage. I know that the pereneal massage is important to me, because that is what helped me birth a big boy with no tearing.