The website says "Made for Moms," the kid in this picture doesn't look all that thrilled with it, and dads aren't mentioned anywhere. But if you're looking for a way to carry a bottle around--whether it's the kid's or your own--and you don't have a Bugaboo wrist strap that you can lynch it with, why not try The Drink Deputy? It's $9.95 direct, plus s&h or shop around a bit.
Of course, if you're trying to carry a cup of some kind, maybe one filled with coffee of some kind, you'll find the Drink Deputy about as helpful as Barney Fife.
The Drink Deputy: To Serve & Protect [drinkdeputy.com]