Klean Kanteen Sport Cap 2.0 Replacement Cap Black 2.0 design has a 25% higher flow rate than the previous version Valve won't chirp or whistle while you sip Cap fits all narrow-mouth Klean Kanteen Classic bottle sizes Clip an accessory carabiner (sold separately) to the integrated loop to hang your bottle from a backpack strap Includes 1 Black Sports Cap 2.0