I wouldn't call this an AIO. It has a single layer of bamboo in the shell and all other absorbancy is in the "optional booster." That booster is necessary, so I think this is more like a lined AI2 functionally. It is a good diaper with that insert in it, though, and I wouldn't mind having more in my stash. I like the booster well enough, in fact, that I am considering getting some to put in my pockets. Some reviews mention size, that this is a big diaper. It isn't. I just compared it to an Imagine OS pocket (not the XL, just the regular OS) and it is actually smaller than the pocket in the waist with the same overall length if not slightly smaller there as well. My baby was 8 lb 9 oz at birth and could wear Imagine pockets from when we first started cloth, which was before he got back up to birth weight. So I think they are OS, and if anything may not fit wider babies quite as long. This is based on my experience with my big but definitely not obese 10 week old.