Big enough to hold a full 18 ounces, yet small enough to fit easily into your pack, purse, bike cage or messenger bag, the Klean Kanteen 18oz Kanteen Stainless Steel H2O Bottle (Wide) is our most versatile size. It's only 6.5 inches high and weighs just 3.75 ounces, so it's small and light. It's got a big mouth too - more than 2 inches wide to be exact! It's quick to refill at the H2O cooler or even a sink, and it's easy to pour from and clean. The threads are 100 stainless steel and the design works with standard backcountry hiking 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). The Klean Kanteen Wide comes with a Stainless Loop Cap that works seamlessly with the Kanteen S-Biner making it a snap to clip it onto a shoulder strap, a work belt or even a climbing harness. Or you can opt for the low profile, stylish and effective Flip D-Ring Cap, available as an accessory. Because Klean Kanteens are 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 tasty.