The Best Vacuum Flask for Keeping Liquids Hot (The 5 Hottest Brands)

At five minutes after 4 a.m., your alarm clock sounds! You get up in the cool dark, and make your way to the kitchen. You select a tumbler, fill it with hot coffee, and are out the door. As you arrive at work or at the campsite, you lean in thirstily for that first hot sip. And, it is ice cold.

This chill down your throat is no way to begin the day. You abandon the old tumbler in the car (or the tent) where it drips a steady stream of cold, sticky liquid through its loose seal. What a disaster! How can this situation be avoided?

Vacuum-sealed flasks are fast becoming best-sellers. Early risers and outdoorsmen who want the warm comfort of a hot sip of their favorite beverage all day long may not be sure which is the best vacuum flask for keeping liquids hot. Here is a list of well-designed flasks for keeping liquids extra hot (or ice cold, if that is your preference).

Vacuum Flasks

Vacuum flasks use double-wall insulation to lengthen the temperature of its contents to remain hotter (or colder) longer. Heat cannot escape or enter the double-wall technology. Meaning, your hot coffee or ice water stays at the same temperature for longer periods of time.

Because vacuum flasks keep things hot when it is cold, and cold when it is hot, they have many applications. Some of the most popular uses of vacuum flasks are storing beverages and soups but they also have many industrial applications.

Most vacuum flasks use a time-proven design to keep things hot. Usually, they feature two layers of either stainless steel or glass as well as a secure stopper. This keeps anything—even heat—from escaping or entering your flask to alter its inside temperature.

This design is popular with the most enduring brands. But, there are a few fresh new takes on the insulated bottle that make this top list of the best vacuum flasks for keeping liquids hot.

Best Vacuum Flask for Keeping Liquids Hot

1. Thermos Stainless King 68 oz.

Where there is a list of the best vacuum flasks, there is Thermos. Thermos has designed an insulated vacuum bottle that meets all your needs. A stainless steel serving cup delivers your hot or cold beverage with class, while the compact, folding handle offers you utility and ease. The best part of the design is the stopper which never needs to be removed in order to pour. The entire design will never sweat, condensate, or leach.

The Thermos King appeals to even the most strict of color preferences with a classic, matte black, midnight blue, or minimal-and-sleek stainless steel.

Easily the most advanced and beautiful design on this list, Thermos keeps liquids hot (or cold) for up to 24 hours.

2. Hydro Flask

Designed with a wide mouth, this sleek flask keeps liquids hot in a safe, BPA-free plastic inside. Food-grade stainless steel makes for an attractive exterior. Its powdered enamel coating gives the user a firm grip on the sweat-reducing flask while also giving added temperature protection.

Twenty vibrant colors and four sizes (18 oz., 32 oz., 40 oz., and 64 oz.) give this design added convenience by setting it apart from other bottles and coming in the right size for many indoor and outdoor activities.

Using its Honeycomb Insulation technology, the Hydro Flask can keep drinks hot for 12 hours, and cold drinks, 24 hours.

3. Iron Flask 32 oz.

Unlike other flasks, the Iron Flask is designed with three lifestyle lids for your drinking pleasure. A straw lid allows you to casually sip. A flip lid keeps liquids secure while allowing quick access to your drink, and a stainless steel lid adds extra temperature control. Never to rust or leach, the 100% BPA-free design is non-toxic and powder-coated for durability.

The Iron Flask comes in just two classic colors: a deep, oceanic blue, or a delicious, lively red.

With double-wall insulation, the Iron Flask keeps drinks hot for up to 12 hours as well (cold, 24 hours) and promises never to sweat or collect condensation.

4. MIRA Vacuum Insulated Travel Water Bottle

Boasting an unbreakable 18/8 stainless steel craftsmanship, the MIRA Travel Water Bottle is slender and light enough for hiking, biking or shopping. The open mouth lid allows for quick, easy hydration as well as simplicity of cleaning. The bottle is also BPA-free, leak-proof, and spill-proof.

Beautiful and yet rugged, the MIRA sports bottle comes in 24 bright colors and soft patterns, including white granite, wood grain, and metallic rose gold.

For the fashion-conscious, the slim MIRA design can keep liquids hot for 24 hours and cold drink for 24 hours.

5. Takeya Originals Vacuum-Insulated Stainless-Steel Water Bottle, 40 oz.

With a food-grade stainless steel construction and lifetime warranty, the Takeya Original water bottle promises never to leave a ring on your desk or moisture on your hands—even after a day’s use. Its proprietary spout lid gives a unique combination of speed and drinkability by form-fitting the mouth. The lid’s twist cap also prevents you from needing to unscrew the lid, sealing the beverage in tight.

Coming in 20 unique colors over 3 design collections, the Takeya caters to your personal taste with such choices as Fire, Onyx, and the American spirit of Red, White, and Blue.

Using time-tested, double-wall technology, Takeya Originals can protect hot liquids for up to 12 hours and up to 24 hours for cold.

Final Thoughts

The icy unpleasantness of a hot drink gone cold or the cough-inducing warmth of sitting water—these experiences never have to be in your life again. Protect your beverages from heat or cold with one of these well-designed, all-in-one solutions. Whether you are looking for a personalized insulated bottle or an advanced vacuum flask, there is something on this list for you.