When you've got a busy day ahead of you, a full schedule of work and play, you necessity a bottle that holds enough to keep you hydrated and happy from dawn to dusk with just a refill or two. When you're on-the-go, the Klean Kanteen 27oz Kanteen Stainless Steel H2O Bottle (Wide) makes it easy to keep the energy flowing. The Additional wide opening is more than 2 inches in diameter and makes filling, pouring and cleaning the bottle a cinch, plus the slim design fits into most cup holders. The 27oz is also the Great size when you're ready to ditch the hustle and bustle of the city for the peace and solitude of the Path. The threads are 100 stainless steel and the design works with standard backcountry H2O filters. The inside of the wide-mouth caps is all stainless too, so your drinks never touch plastic. In fact, the only plastic on the Klean Kanteen Wide is on the outside of the cap; and of course it's BPA-free polypropylene (pp#5). It comes with a Stainless Loop Cap that works seamlessly with the Kanteen S-Biner. Or you can opt for the elegant and effective Flip D-Ring Cap, available as an accessory. Because Klean Kanteens are made from food-grade stainless steel, they don't necessity to be lined and will never retain or leach flavors. No matter how many times you refill it, no matter what you put into it, the drinks in your Klean Kanteen will stay New and delicious.