What are some "can't live without" pantry staples?

I cook just about every main dish with onion and garlic. I always have to have at least 4 onions and 1 garlic head in my house at all times because if I don’t I will run out before the end of the week. If I have garlic and onion, I can pretty much scrape up anything in the freezer or pantry and make it edible.

What do you feel like you absolutely always need to have on hand in your kitchen?