I use Klean Kanteen's almost exclusively for the kids (I even have a photo of one of ours up on KK's website - their web designer used it for a banner) and we probably have 10 of the samller 12oz bottles, and my 8yo has an 18oz. I have a couple of the larger 27ozfor myself, but I prefer Camelbak's... I have some of the regular BPA free plastic bottles, and a SS insulated one (just got that).

I want to try to new wide mouth KK's