Anything from a backpack to a suitcase depending on how prepared you are. I am just going in with a diaper bag for LO and small duffelbag that I use to take carryon on planes for me. Neither are super full though, so I could go smaller but it's what I have.
Just one you can fit everything you're taking in, I have a small hold-all for baby's stuff that I'm borrowing off my mum and dad and the one for me is from my sister, so ask family/friends if they have any spare small suitcasey/hold all bags when you have everything you need to go in it
It doesn't really matter what size. I had quite a large bag to carry all of my stuff. But, I took a lot of unnecessary things (my straightener, hairdryer for pictures LOL I just never felt like doing my hair so I brought them for no reason, really). Just look at different lists of what to take to the hospital. It doesn't matter what size, as long as everything fits in just fine!
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