Easy and convenient, the Hydro Flip is great for hot and cold beverages alike. Paired with the 18oz Wide Mouth, it's a perfect combination for tea and coffee drinkers or simply for those who want quick, one-handed access to their drinks. Made out of 100% recyclable PP#5 and BPA-free, the Hydro Flip lid features a flip-top opening with rubber stopper to plug the opening and help prevent spills when not in use.
- Wide Mouth 2.2 inches
- Double Wall Vacuum Insulated
- 18/8 Stainless Steel
Our stainless steel water bottles are constructed from uncoated 18/8 stainless steel, so there is no danger of a liner getting scratched and releasing the toxic chemical BPA or Bisphenol-A into your beverage. Consequently, your Hydro Flask bottle can keep hot liquids hot without the leaching of chemicals that may occur with plastic and aluminum bottles. With Hydro Flask, you can be sure that all of our products are 100% BPA-free.
The hazards of BPA have long been suspected, though confirmed only as recently as 2006. It has been shown to contribute to hazardous conditions such as developmental toxicity, carcinogenic effects, heart disease, diabetes, neurotoxicity, and abnormally high levels of certain liver enzymes. It has also been linked to obesity, cancer and possible brain damage.
18/8 Stainless Steel
The following is an explanation of the chemical properties of our beloved Hydro Flasks. If it's enough for you just to know that they're the best reusable drinking bottle you'll ever own, then you're dismissed. If you need more scientific proof to convince you, then read on!
At Hydro Flask, all of our bottles are manufactured using 18/8 stainless steel. So what the heck does 18/8 mean? It indicates the quality of the stainless steel and refers specifically to the percentages of chromium (18%) and nickel (8%) added to provide the anti-rust/staining properties that carbon steel lacks on its own.
There are different grades of stainless steel available, with the numbers denoting their quality. Higher numbers indicate more corrosion-resisting properties, while lower numbers denote the inferior characteristics that lead to the aforementioned staining.
At the lower end, steel must contain at least 10.5% chromium to be called stainless. 18% chromium is the standard for top grade when used in flatware or cutlery, so almost all high-quality flatware has an 18/8 composition and is dubbed "food grade." Chromium adds hardness and brightness to stainless steel, making it the source of the metal's shine, and nickel is added to prevent corrosion by enhancing the surface layer that chromium creates.
18/8 stainless steel is the preferred material wherever food or beverages are concerned because it does not affect flavor, either by adding any metallic taste of its own, or by retaining any flavor from the previous foodstuffs with which it came into contact. This is a function of the combination of chromium and nickel, which creates a non-porous surface that inhibits the growth of bacteria. Bacteria, which are the cause of odors, like to cling to porous surfaces where they can thrive. At the first sign of soapy water, any bacteria that have dried onto the surface of 18/8 stainless steel are swept cleanly away.
Hydro Flasks benefit from all of the superb qualities of 18/8 stainless steel, so you'll never have to worry that the hot coffee you took for your late-night lab session will stain your bottle or ruin the taste of your ice cold milk the next day.
Hydro Flask 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. The double wall vacuum insulation technology allows Hydro Flasks to keep contents hot for 12 hours and cold for 24 hours.
Double Wall Vacuum Insulation
Everything that has matter conducts heat, including water, air, plastic, aluminum, and stainless steel. A vacuum is created when all of the air is removed from a sealed object. In other words, a vacuum is a space that is empty of matter, and each Hydro Flask contains a vacuum seal between two walls of food-grade 18/8 stainless steel. (If you've already figured out that a vacuum is a terrible heat conductor because it's composed of almost nothing, you're way ahead of "the other guys.")
Hydro Flask's patent-pending double-wall vacuum insulation means that the temperature outside a Hydro Flask has a very hard time affecting the temperature of whatever you might put in it. The best part is that this is a two-way street; whether you've got hot or chilled liquids inside of your Hydro Flask, the internal temperature won't affect the temperature of the container in your hand. That means no blistered fingers with your daily cup of Joe, and no troublesome sweat rings-from your bottle of ice water. Hydro Flasks are pretty amazing, but we can't make guarantees about individual personal hygiene practices!
At Hydro Flask, the designers didn't come up with "yet another reusable water bottle." They've created a technologically superior piece of hydration gear, one that puts a double-wall vacuum insulated barrier between itself and the competition.