I'm currently trying several different types of aio's as i'm getting lazy in my old age!!!
Ben's currently wearing a Rosies aio and it's lovely. Nice fluffy material around the legs and waist and it's a large, so would be able to hold quite a bit i'd say. I've tried it a few times now and am pretty impressed.
I hope the swaddlebees is good (I haven't received it yet - just bought it today!). I really liked the fit of the old medium pocket I had, even though it didn't hold much being so trim. I'm looking forward to getting this new sb. Very exciting!