Can i take a backpack, a collapsible hula hoop, and a suitcase on a flight?

So I bought a collapsible hula hoop to take on my travels (google it if you've never heard of it) and it doesn't fit in my suitcase. Yeah I know. Fml. So now I need to know can i take a backpack, a collapsible hoop, and a suitcase on a flight?