I just had a quick look at the hug a bub website. From what I can see, the Close Baby Carrier is a 'pre-tied' version. So instead of tying it yourself the back is already joined and you just pop it on like a t-shirt. Then the rings at the side help tighten and loosen as needed. I bought a moby wrap that I had to tie myself, but found that a bit too hard. This one is great.