Our Klean Kanteen Wide 27 oz water bottle is a full stainless steel water bottle with full stainless interior. Included Loop Cap has a stainless steel base so your favorite beverage never touches plastic. Wide mouth opening is easy to fill, clean and single-wall construction is very lightweight and durable. Slim design fits most cup holders, bike cages and is a favorite for backpackers since the wide mouth opening fits most backcountry water filters for clean and safe water anywhere!