The Klean Kanteen KCSSL-BS is the correct replacement cap for the following water bottles:
The Klean Kanteen Stainless Steel Loop Cap - Black is a replacement cap for all sizes of Klean Kanteen Classic water bottles. The Klean Kanteen cap is constructed with food-grade stainless steel and creates an all-stainless interior for your water bottle. The Klean Kanteen Loop Cap has a convenient attachment loop and is safe for dishwasher use.
Klean Kanteen Stainless Steel Loop Cap - Black specifications: