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ecovessel boulder bottle

Sick of plastic water bottles where even the insulated ones can only keep water cold for an hour or two?

I am. It’s not a big deal for daily rides, but let’s say you’re camping for the weekend. Perhaps you’re doing an MTB stage race. There might be a water source, but unless you have some giant ice coolers running off your car’s battery, your chances at enjoying ice cold water are slim!

So that’s why I was excited to test out this Eco Vessel Boulder Insulated Water Bottle. It’s triple insulated stainless steel, so it’s not the typical bottle to carry during a bike ride. But the claim is that it will keep water cold for up to 36 hours and retain heat for up to 8 hours!

It uses their Trimax® triple insulation technology, which is all vacuum insulated stainless steel. This not only keeps the bottle’s exterior at a comfortable handling temperature, it means the bottle won’t sweat! And since there’s no liner in the bottle, there’s no BPA to worry about.

I got the 25oz bottle, which seems like an uncommon size, until you refer to it in ml… It’s 750ml, the normal size for a wine bottle. It also comes in a 17oz size, but I’ve always thought anything under 20oz was too small for an endurance athlete.

There’s also a bigger size if you need it – in which case, the 45oz Eco Vessel Bigfoot is the choice for you!

I bet the Bigfoot would be an awesome bottle for a big road trip, but for general everyday use where you have to carry the bottle, the 25oz size is going to be much more convenient. It’s already one pound, empty!

I used this bottle for a couple months, mostly carrying ice water and hot green tea. You could also carry iced tea, hot coffee, or even soup, but I just stick to the basics. Here’s what I thought…

This is a sweet water bottle!

I have other steel water bottles, but none quite like this.

Screw top lid

Straw tops are convenient, but when I’m looking for something dependable, I go with a screw top. I think they’re more secure and definitely more durable. I tossed this bottle around and nothing broke and it never leaked!

That’s not all, though – this cap actually unscrews in two parts. The base unscrews, giving you a wide opening that’s mainly for filling. It was big enough for every ice cube I tried to shove down. The top unscrews to reveal a plastic drinking spout that’s easy on your lips and just the right size.

ecovessel boulder bottle

I’ve chugged water from the bigger metal opening, and it’s not bad, just not as comfortable compared to the plastic one.

ecovessel boulder bottle

The only minor problem I’ve had is that if you tighten the drinking spout too tight, you may accidentally unscrew the whole lid next time you open it. You have to use just the right technique, either holding the base of the cap or not tightening the top of the cap as tight as the base.

The only way to get rid of that problem would be to only have one opening. Well, I prefer the two openings, so I’ll stick with it as is!

*Get the Eco Vessel Summit if you want the flip-top straw.

Contoured shape

This is a hefty bottle, so you’d need pretty big hands to get a grip on it… if it wasn’t contoured! The bottle has a contoured shape where it tapers in at the middle, sort of like an hour glass. This way you can get a firm grasp on the bottle even with small hands.

To add to that, the bottle has some texture to the finish, making for a grippy surface, even if you have sweaty hands or are wearing winter gloves.

This bottle should not be slipping out of your hands!

Removable tea strainer/ice dam

This is super neat! I’ve never even seen this feature before.

This metal strainer insert sits right at the mouth of the bottle, making sure nothing but liquid comes out. So any ice cubes won’t clog the small drinking spout.

ecovessel boulder bottle strainer

If you drink loose leaf tea, you could actually brew your tea with the Eco Vessel! Just scoop the tea leaves directly into the bottle, then rely on the strainer to keep it all in there.

Prefer infused water? You can make that, too! Put some sliced cucumber and lemon zest (or your favorite flavor combo) in the bottle, let it infuse with cold water for a while, then drink. The strainer means that only the water will make it into your mouth.

Easy to clean

The directions say to hand wash the bottle using warm soapy water for everyday cleaning. That’s what I always do. This bottle is a piece of cake to clean because there’s nowhere for mold to hide like in a Camelbak bite valve. You just need a bottle brush to reach inside. (Optional: use vinegar and baking soda for more thorough cleaning if needed.)

Of course, if you’re putting loose tea and/or fruits and veggies in the bottle, plan to spend a little more time cleaning it out!

Vacuum insulated

This bottle is insulated! I timed it, just to make sure!

I ran some unscientific tests.

And here’s what happened:

Test #1: Ice water, indoors.

For this test, I packed in as many ice cubes as I could, then topped off with filtered tap water. So I had ice cold water, which was claimed to stay cold for 36 hours.

Started at 2:30 PM on a Tuesday afternoon.

Sampled at 4:00 PM: Still freezing cold, ice cubes intact.

Sampled at 7:00 PM: Just as cold! It’s ice cold!

Sampled at 10:30 PM: Still freaking cold. Ice cold… because the ice cubes were still there!! I was about out of the water, so I refilled with tap water.

11:00 PM: Now the slightly cold tap water was freezing!!

8:00 AM: Wow, there are still ice cubes!! That’s crazy. It’s been over 16 hours!

2:30 PM: 24 hours later. This is getting ridiculous. The bottle is sitting beside the heater now, and there are still small ice cubes left inside!!

I’m just going to conclude this test and say that it far exceeded my expectations! I have no doubts it would have kept things cold for 36 hours under those conditions. (We’ll repeat this test outdoors in mid-July heat next time.)

Test #2: Hot tea, indoors.

Filled it up with about 24oz very hot water and a teabag. It was steaming hot!

Started on a Wednesday at 8:00 PM.

11:00 PM: Still steaming hot. Not burning hot, but nearly.

8:00 AM: Still hot, but comfortably hot. Just hot enough to be “hot” rather than “very warm.” Ideally it will stay this temp, because it’s a very enjoyable drinking temperature.

9:00 PM: Just barely lukewarm. Not bad, but not as fun to drink as it was in the morning. Still a little warmer than it would be, had it sat in a cup on the kitchen table.

So it will keep drinks hot for the claimed 8 hours, easily. Depending on how hot the drink starts out, it will probably be at a nice drinking temperature for 12-16 hours!

Test #3: Hot tea, outdoors, in the snow.

I repeated the hot tea test again, this time filling up with hot tea around 10 or 11 am. And I left it in the cold garage or out in my Jeep the whole day. (It was certainly below 32 degrees F outside, so much cooler than in the living room.)

I drank my hot tea at camp around 8-9 PM that night, so it had sat out for at least 8 hours. Well, it was still steaming hot!! Almost too hot to drink comfortably from the bottle, actually.

And that was all without “pre-warming” the bottle or anything. (As in, fill the bottle with hot water, let it sit for a few minutes to warm the metal, dump it out, then put your hot drink in.)

So what’s wrong with it?

For the first six months, I couldn’t find anything wrong with the bottle.

Then… I started spilling water on myself. Then, after assuming I was just clumsy, I started finding water in my gym bag. Then I found the source of the problem!

Turns out the Eco Vessel cap was leaking!

The source of the leak is the plastic threads inside the top of the cap. I’m not sure if they are weak and wore down from use (it’s made in China after all,) or if the hot tea I put in there was too hot and deformed the plastic, but something happened, and it doesn’t seal shut anymore.

At first, it wasn’t bad. The water would work its way up the threads and sit there, so that when you opened the cap and went to drink, there was some water that would immediately spill on your shirt, the floor, your desk, your computer, etc. – whatever was nearby.

It got progressively worse, and now, I can’t leave the bottle on its side or the water will leak out. It’s a small leak, but it’s enough to get water on stuff that I’d prefer to keep dry!

I contacted Eco Vessel customer support on their website and they got back to me with a useful response in less than 24 hours. They acknowledged it shouldn’t be leaking, but the thing is, the solution is for me to buy a new cap for $3.95 (about $5-7 after shipping costs.)

Someday, I might do that. The insulating capability of the bottle is excellent. I freaking loved the thing before it started leaking. But I have to wonder, if I got a defective cap before, who’s to say that the replacement cap won’t have the same fate?

For now, I’ll use this as a backup bottle for messy situations where leaking isn’t that big of a deal.

Is it right for you?

Aside from having to buy replacement parts after six months of use, the only problem would be buying the bottle for the wrong purpose.

See, it’s totally awesome for going to gym, carrying in your car, etc. It’s even better for a weekend MTB stage race where it’s hard to get ice-cold water once you’ve set up camp.

But when it comes to hiking, it’s a tad heavy. Like, real heavy. So you have to decide if the insulation is worth the weight.

And sadly, you won’t be able to use it on your bike in a traditional water bottle cage.

My final verdict is…

This is a good quality bottle that’s worthy of the $26.95 price tag (if you get a lid that’s not defective). If you don’t mind trading weight for good insulation, it’s right up your alley. It should keep your drink hot or cold all day (up to 8-12 hours for hot drinks and double that for ice water) no matter the external temperature.

I still think they’re worth considering, but I’m hesitant to buy another.

Official website: www.EcoVessel.com

Buy online: www.Amazon.com

Product Review Details
Company: Eco Vessel
Product: Eco Vessel Boulder Insulated Water Bottle
Reviewed by: Coach Levi
My Rating: 3.0 out of 5
Date last updated: 2017-03-14
Obtained Product: Free sample from company.
CoachLevi.com Advertiser: No.

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  1. I have great concern with the chemicals used in manufacture of any plastic or metal drink / eat container {cancer and other concerns}.
    Glass lined might be safest.
    This article did not address such issues.

  2. @EL

    Thanks for the comment. It’s certainly possible that glass might be the safest material, but who knows for sure.

    What I do know is, I trust stainless steel bottles over glass to hold up to outdoor abuse!

    If you want glass instead, there is an option from EcoVessel. It’s glass, insulated, and has the strainer top. I bet the CamelBak Glass Eddy is probably pretty nice too.

  3. I have similar experiences as the writer, but mine didn’t last a few months, it lasted a few days. I bought one for me, and one for my fiancé, and both leaked terribly. Too bad in my country there is no warranty available. For the cost, i was hoping to have a premium product, but got a major let down, and lost money, as i can’t use them.

    • @Joe

      Huge bummer! 🙁

      Exactly – for this price, you should be getting a premium product and top-notch customer service!

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