I bought the blue one. It's super cute and can be worn by itself, but it's also very comfortable and great. It has a zipper at the neck so you can open it as much as you like.
I bought the black one. I use it for school, and the shoulder straps are sturdy so I can carry textbooks around with peace of mind, and there's plenty of room for clothes, shoes, etc. It's bigger than it looks. The lace is made into a ribbon, so I like how it looks cute even when I put a stuffed animal in it.