Yay, itti bitti's are fantastic! They're the only nappy I use lol. DDI has given the perfect description, **** much more I could add there.

I did just want to say though, I have the mediums and 14 month old 10kg DD still fits in them perfectly. As for absorbancy, I use them as an all in one (so with no extra snap-in) but because DD is quite a heavy wetter they don't tend to last longer than 2.5 hours at most. The tuttos are the way to go for things like long car trips where she'll be sitting in it for a while.