In previous years, we tested this bottle with the classic lid. This year, we tested out the Klean Kanteen Sport Cap, tested here, which is claimed to assist with drinking on the go. We found the Sport Cap to be a bit finicky in terms of leakage and closure. Without it, the Klean Kanteen is still a great option for a lightweight, metal bottle, but the cap adds complexity and thus reduces the bottle's overall metrics score.
The old simple favorite, the Classic has been updated with a new cap, called the Sport Cap. The sport cap has been modified, according to Kleen Kanteen's website, to improve flow rate, to resist leakage, and add "quieter performance".