I saw those and thought they were so neat, so I bought one of these smaller kids size Brita bottles for our last trip, along with the larger Brita bottle we have been using for quite some time. The problem I had with the kids size bottle is that the filter is set so low inside the bottle that you'll be sucking air as soon as the water reaches the half-full mark. This meant re-filling it constantly. It was kind of a pain, so we stopped using it after the first day. We just stuck to the big bottles which I love. I suppose the kid size Brita would work better for very small children who don't drink as quickly as older children, because for the older child in our party, it didn't work so nicely.