Hydro Flask 21 oz Standard Mouth Stainless Steel Water BottleThe 21 oz is ideal for taking on the weekend bike ride or hike to keep your fluids cold. Or take it up the mountain and have coffee, hot cocoa, or soup waiting for you at the end of the day. The standard mouth features a larger opening than Hydro Flask's original, narrow mouth bottle. It is ideal for coffees, teas, mixing sport drinks, or just for those who need to take in more hydration, more quickly. As with all Hydro Flasks, they fit perfectly in most car, bicycle, and stroller cup holders and water bottles cages. These, stainless steel water bottles, were developed to perform in every environment. Each Hydro Flask is hand cast from double wall vacuum insulated food grade 18/8 stainless steel, therefore they are BPA-Free and resistant to bacteria and odors. Double wall vacuum insulation technology allows Hydro Flasks to keep contents, hot for 12 hours and cold for 24 hours. Features:&bull, Patented Standard Mouth Size & bull, Double Wall Vacuum Insulated & bull, Keeps Hot 12 Hours & bull, Keeps Cold 24 Hours & bull, BPA-Free & bull, 18/8 Stainless Steel & bull, Signature Matte Finish & bull, Lifetime WarrantyAlso check out Hydro Flask's Wide Mouth and Narrow Mouth styles! Which Hydro Flask Should I Get Wide Mouth: Easy to fill with drinks, filtered water or ice cubes from your ice maker. Even easier to drink from-its wide mouth allows for a sip to a gulp in no time flat. Has attached, screw on type cap that won't get lost, yet easily gets out of the way while hydrating. Standard Mouth: Very popular because it's easy to fill and easy to drink from. Top has handy built-in finger hole so its easy to tote or clip to your backpack or jog stroller with a carabiner. Narrow Mouth: Easiest to drink from when you're on the move because you can seal the opening with your mouth. Plus, it's most similar to the plastic water bottles you used to swig from. Its top has the handy built-in finger hole so you can grab it qui