Any City, USA. Klean Kanteen is working on a stainless steel baby bottle (!) The Kid Kanteen will be introduced in early 2010. In the meantime, Pura Stainless has beat them to the punch, introducing its Kiki line of baby bottles that convert to sippy cups. Pura Kiki bottles work with most brands of nipples, including Dr. Brown’s and BornFree. Pre-order now at purastainless.com.