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Top Picks

How we choose: The best thermoses highlighted here were selected based on 42 reviews of 28 products. Our top picks are those that are readily-available in the United States and have received the highest overall ratings from reviewers.

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Klean Kanteen Insulated TKPro

user rating: 4 of 5 (1 review)

The Insulated TKPro (25oz.) bottle from Klean Kanteen is everything an insulated bottle should be—durable to the max, well insulated, easy to pour, and comes with a comfortable cup. This bottle is a solid choice for those needing a solid insulated bottle.

Reasons to Buy

  • Keeps hot things hot and cold things cold
  • Rock solid construction and design
  • No plastic
  • Large, insulated cup for drinking
  • 360 degree pour-through spout (no spilling)

Reasons to Avoid

  • Narrow bottle mouth
  • Lid can be hard to remove

Conditions: I’ve used the 25 oz. Klean Kanteen Insulated TKPro (also comes in 16 oz. and 32 oz. options) for three months in the spring and summer, including during car camping adventures, a few fishing and deer scouting trips, and on a roadtrip. I’ve used it for hot beverages, namely coffee and tea, as well as keeping soup hot. I’ve also used it for iced coffee in the dog days of summer. This fall and winter it will be my go-to coffee or soup kanteen for hunting, and it would have been a go-to vessel for tailgating, but that’s cancelled this year.  A slick-looking, tough-as-nails, insulated drinking vessel.   The TKPro may be big, but still packs easily in my Osprey Talon 22 pack's side pockets.

Read more: Klean Kanteen Insulated TKPro review (1)

Top Water Bottle / Thermos

Hydro Flask 64 oz Growler

user rating: 4 of 5 (2 reviews)

More than just an oversized water bottle, this vessel goes everywhere with me. Keeps soups and hot drinks hot, and keeps cold adult and non-adult beverages cold.

Reasons to Buy

  • 100 year or one lifetime warranty, includes the plastic cap
  • Durable, food-grade 18/8 stainless steel (no BPA here)
  • Double-walled vacuum insulated (hot things stay hot, cold things stay cold)
  • Doesn't sweat like other bottles do
  • 5% of net profit goes to charity of your choice

Reasons to Avoid

  • Heavy (just shy of 1.75 lbs.)
  • No handle (I plan on making my own)

While this bottle/growler is too heavy to take hiking and way too big to fit in my bike's bottle holder, it is still very handy and gets used way more than I initially thought it would.  I purchased it two years ago thinking it would be nothing more than a durable beer growler and an upgrade from my glass growlers that I was always afraid of breaking in transit. However, I've found this to be much more useful than just a beer growler (although it is still good for that purpose). Other than as a beer growler, the two most common scenarios I use it in are:1) Cold Weather, Hot Drink: Because it keeps things hot for a whole day no matter what the outside temperature is, I can fill it in the morning with hot chocolate, coffee, or soup, leave it...

Read more: Hydro Flask 64 oz Growler reviews (2)

Water Bottle / Thermos

Hydro Flask 40 oz Wide Mouth

user rating: 4 of 5 (6 reviews)

A super durable, insulated water bottle that carries 40 fluid ounces (1.18L). When weight is a concern (i.e. long backpacking trips), I don’t take this along, but otherwise, it is with me wherever I go.

Reasons to Buy

  • Durable
  • Lid loop makes it easy to carry
  • Large volume
  • Wide mouth makes the bottle easy to clean
  • Can be used as a rolling pin...seriously!

Reasons to Avoid

  • Lid is a little tricky to clean
  • Lid can be difficult to unscrew for those with smaller hands
  • Big base—doesn’t easily fit into standard bottle pockets

Conditions:I’ve owned the Hydro Flask 40oz. Wide Mouth bottle for a year, using it to carry water for hiking trips, paddling trips, to the climbing gym, camping, and on road trips. Construction and Durability:The Hydro Flask 40oz Wide Mouth is a beast of a bottle. It’s made to last a lifetime (hence the lifetime warranty). It would take the force of an entire army to break the bottle. Okay, maybe that’s slight hyperbole, but I’ve used and abused the bottle and it shows very little sign of wear other than a few scuffs.  Size:Carrying 40oz (1.18L) of liquid, the bottle is pretty big.

Read more: Hydro Flask 40 oz Wide Mouth reviews (6)

Stanley Classic Legendary Bottle

user rating: 4.5 of 5 (1 review)

Sturdy but heavy vacuum flask.

Reasons to Buy

  • Sturdy
  • Good heat retention
  • Large cup with wide base (stable on uneven ground)

Reasons to Avoid

  • Heavy

The Stanley Classic Legendary Bottle 0.47 litre vacuum flask. This vacuum flask (0.47 L / 16 oz) is rated to keep liquids hot or cold for 15 hours. I have not tested this: what I can say is that I have taken the flask on walks lasting six hours and it has kept my coffee hot throughout.   Stanley advertises its vacuum flasks as rugged and resistant to knocks. I have not tested this either (I like to take care of my gear). But I can believe it because the flask looks and feels hefty for its advertised volume.

Read more: Stanley Classic Legendary Bottle review (1)

Water Bottle / Thermos

Hydro Flask 21 oz Standard Mouth

user rating: 4 of 5 (4 reviews)

HYDRO FLASK Narrow Mouth Water Bottle, 21 oz.

Reasons to Buy

  • Insulates well
  • Fits in cupholder

Reasons to Avoid

  • Difficult to clean if used with other liquids

This is a doubled walled stainless steel with a vacuum between the two walls so it insulates really well. It has the standard narrow mouth and cap. Even though I had the other two Hydro Flask bottles, my wife talked me into getting this one too, as it was on sale. It turns out I like it a lot more than I would have thought. My main concern was that the narrow mouth would make it too difficult to put ice in it, but I find that I can squeeze a few cubes in, and then because it is so well insulated, it stays cold a long time.

Read more: Hydro Flask 21 oz Standard Mouth reviews (4)

Water Bottle / Thermos

Hydro Flask 32 oz Wide Mouth

user rating: 4.5 of 5 (2 reviews)

Good at containing heat for liquids. Can be used for soups if wanted or drinking liquids.

Reasons to Buy

  • Heat containment

Reasons to Avoid

  • Weight

I use the Hydro Flask on overnight trips often. Good for storing ice cold water, then in the morning I will keep my coffee in it. It will keep my water cold for at least a day, I usually finish drinking it before then though. Durable design, haven't had any problems with it denting after 5+ trips. If you are into very lightweight packing this is probably not necessary since it weighs slightly more than a regular water bottle, but again this is a thermos not just a water bottle. Can't think of much more to critique it on, overall great item to have.

Read more: Hydro Flask 32 oz Wide Mouth reviews (2)

Primus TrailBreak Lunch Jug Large

user rating: 3.5 of 5 (1 review)

Good to keep food warm for a few hours, do not expect insulation to equal a good water thermos. Recommended if you prep a hot meal in the morning to take for lunch.

Reasons to Buy

  • Decent weight (550 ml / 360 g)
  • Good large opening
  • No taste
  • Easy to clean
  • Good price
  • Good craftsmanship

Reasons to Avoid

  • Insulation could be improved

I bought it recently for a solo winter trip in the mountains I am planning, the idea being that I will cook in a large pot in the evenings, eat dinner, and save half for next day's lunch. This way I have a hot meal ready to stave off hypothermia if the temps drop abruptly in the night, and I save some fuel by cooking larger quantities. The jug is well made, robust, the powder coating is nice. It securely closes; I expect no leaks as a silicon like joint presses on an inclined shape inside the opening.

Read more: Primus TrailBreak Lunch Jug Large review (1)

Klean Kanteen 20oz Wide Insulated

user rating: 5 of 5 (1 review)

This water bottle does not seem to be as prone to the dent commonly seen on metal water bottles. Most importantly however is the fact that I've had the same ice in it for the last 36 hours and it is still going strong.

Reasons to Buy

  • Solid construction
  • Phenomenal insulation (Cold seems to be a little better than hot)
  • Not showy
  • No funky taste. Ever!

Reasons to Avoid

  • A bit on the heavy side
  • Upfront cost
  • If you're drinking something hot, where you put your lips can get very warm

So, every year when my REI dividend comes in I tend to get an item that I cannot justify otherwise. This years item is the Klean Kanteen 20 oz Insulated Water Bottle. I admit that the price really had me think twice, but I was tired of using my Nalgene water bottle as my everyday beverage-holder-of-choice. I wanted something that looked more professional and kept my water extra cold. Long story short: I am very satisfied with my purchase. Ease of Use: Well, It is a water bottle after all.

Read more: Klean Kanteen 20oz Wide Insulated review (1)

Klean Kanteen 12oz Wide Insulated

user rating: 4.5 of 5 (2 reviews)

Takes the prize for a pack-ready, sip-top insulted mug/bottle. The totally reliable seal opens with a twist, and the top disassembles easily for cleaning. Looks like it should take a lot of abuse.

Reasons to Buy

  • Sip top with reliable seal
  • Top disassembles easily for cleaning
  • Durable

Reasons to Avoid

  • Two-handed operation to open for sipping
  • Top needs frequent cleaning

I am on a quest for the Holy Coffee Cup, and this one is getting pretty close. What I want is an insulated mug with a totally reliable seal that won't leak in my pack even if I take a 1,000-foot fall down a couloir, that can be opened for sipping with one mittened hand without having to find a place to put down a cup or lid or any other loose parts in the snow, and that will keep my coffee at a perfect drinking temperature for at least 6 days and weighs less than 2 ounces and won't break or deform after falling off a cliff due to unintended droppage and can be cleaned without calling in Mary Poppins.

Read more: Klean Kanteen 12oz Wide Insulated reviews (2)

Stanley Classic Vacuum Bottle

user rating: 5 of 5 (2 reviews)

Great insulation both ways.

Reasons to Buy

  • Small
  • Sturdy
  • Heat retention is amazing

I have been using older sizes of the very same flask for ages now. Each and everyone of them fulfilled my expectations just fine. The last addition to my Stanley line of steel flasks is this 16 oz one. The same old great product gets even smaller, which is just the perfect size for a winter backpack. The whole thing inside and out is steel, so I do not worry about the hot water coming in contact with a plastic material. However, the inner cap and the inside of the screw on drinking cup are plastic, which I hope is BPA free.

Read more: Stanley Classic Vacuum Bottle reviews (2)

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