Whether you're heading out for a short hike or giving that big presentation at work, the 18 oz. Klean Kanteen Classic holds enough to keep you hydrated, but is also small and compact so it fits easily into your bag, pack or briefcase. BPA free. Weight: 6 oz. Sport Cap 3.0: Everything that the original Sport Cap has, plus: soft silicone spout delivers 25% higher flow rate, relief valve is "chirp" and "whistle" free, cap is leak resistant.