Hydro Flask Insulated Wide Mouth Flat Cap - Wide Mouth

Hydro Flask Insulated Wide Mouth Flat Cap - Wide Mouth
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Designed for everyday use, as well as the rigors of the outdoors, our Wide Mouth Flat Caps are insulated to aide in keeping your Hydro Flask contents cold or hot and at the optimal temperature.

The Wide Mouth Flat Cap fits our 18 oz, 40 oz and 64 oz Wide Mouth Hydro Flasks. Please note that the Insulated Flat Cap does not fit on the older style Wide Mouth flasks. To find out which style flask you have and whether the Hydro Straw Lid will fit yours, check out the Wide Mouth Fit Guide.

Posted by Oscar Flores on 04/24/2014

2 Star Rating


I wish I had something different to say, mine at least lasted a couple months. My question is how would you replace this cap if the ring is fitted to the bottle, its not like it stretches, but that may be the answer, (Hydroflask...patent pending....)

Posted by Rich on 04/19/2014

5 Star Rating

Love it!

I'm not sure what the people complaining about broken lids are doing with their water bottles but I have been using mine for a year or so now, commute to and from work on buses and trains while holding the bottle by the lid strap and have never had an issue. In fact when I first bought my Hydro Flask I thought the strap was going to be a hinderance but now I depend on it! Great products guys and gals!

Posted by mary on 04/12/2014

1 Star Rating

breaks easily

Mine broke within a week. I love the bottle and I am a Nalgene convert...but I could THROW my Nalgene at a brick wall and it would hold up. This lid broke when it rolled out of my car. Offer a replacement metal option, please!

Posted by hiking mom on 03/29/2014

1 Star Rating

expecting more for what you pay

the title says it all.... excellent bottle but this is my fifth lid. Extremely disappointed HydroFlask can't make anything better.

Posted by Hiker/ paddler on 03/18/2014

1 Star Rating

Wide mouth cap

Really disappointed in the cap for my 40oz bottle. The bottle fell out of my pack from bench height and the cap cracked open - luckily the rubber band is mostly holding the cap together still. Then, after a day of hiking and opening/ closing the bottle many times, the plastic circle on top of the cap fell off! So, basically, the entire cap disintegrated after one day of hiking with it. As other reviewers have said, this is really disappointing considering the high quality if the bottle itself.

Posted by Phoebe on 03/10/2014

1 Star Rating

cap review

The thermos is awesome and keeps my ice water icy all day, but I've had to replace this cap three times now. The strap breaks very easily and so does the cap if the bottle drops a certain way.

Posted by Tiffany on 03/09/2014

1 Star Rating


I've had about 6-7 of these lids and either the strap cracks until it breaks or the top part pops off the lid. While I love that it seals perfectly and does keep liquids hot or cold, I can't look past how many times I've had to replace my lid.

Posted by Punk on 02/17/2014

3 Star Rating

Old ones great - new ones are not great

I have used this cap on an 18oz bottle for 16 months with no problems. I take it off the bottle regularly. A couple of times per day. That one is still going strong. A new one purchased with the same style bottle lasted less than 6 weeks. It snapped at the ring as others have reported. Disappointing.

Posted by ipictia on 02/15/2014

1 Star Rating

Awesome Stainless Steel Bottle, CRAP CAP

You've designed a great bomb proof insulated bottle. Stuff stays cold for days. But the cap is really weak. You need to design and offer an indestructible stainless cap

Posted by Matt on 02/14/2014

2 Star Rating


Great bottle but the strap part of the cap snapped in the first month under normal usage. Disappointed that such a nice bottle has such a cheap cap.

Posted by Adam on 02/06/2014

1 Star Rating

I Echo the Rest

So far this is the best bottle I have owned. But the cap is crap. I can't believe it is so fragile for a bottle that seems so robust. This was not on my the hood of my car.... There was no adverse trauma to occur other than a 2ft drop. An indirect hit at 2ft. Not thrown at the ground... It just tipped off a 2ft tall garden wall. SO, I wish there was another more durable option.

Posted by Erin on 02/01/2014

1 Star Rating

This top is terrible

I have had this water bottle for 2 months. Why would you incorporate a plastic top on a stainless steel body? It has broken twice already, and now I have to replace and they offer no better piece. Come on Hydro Flask, please offer us something else!!!

Posted by Bikram Yoga bottle user on 01/30/2014

1 Star Rating

This is a rating of the wide mouth flat cap

This is a rating only of the wide mouth flat cap for the hydro flask. The RING portion of the lid is not durable. I have the 40oz bottle and the 62oz bottle. The ring on the 40 oz bottle snapped 1 month before the ring on the 64 oz bottle snapped. The lid itself is durable and doesn't leak water, but the ring needs improvement. The bottle itself is sleek and can easily slip between hands while carrying so a ring or handle of some sort is helpful to tote the bottle around. Please improve the ring of this lid!

Posted by Mert on 01/28/2014

1 Star Rating

Great bottle but terrible cap

So far the best water bottle I ever had...but they need to improve the cap. Plastic part is not strong enough. Your's will definitely break too...

Posted by Jonathan on 01/20/2014

1 Star Rating

Just like everyone says, awesome bottle, but the lid is junk

I love this bottle, it will keep ice in it way longer than advertised. However any drop on a surface other than carpet from a height of more than 2 feet will shatter the lid if it hits first. You need to figure out a stronger cap. Knowing the tradeoffs required for engineering, I would gladly trade some insulation for some durability. I've never had to replace any Nalgene caps (except one that melted from the dishwasher element). However they will make it right and replace it, but I will be buying a second so that I always have a spare.

Posted by Wide Mouth Lid on 01/19/2014

1 Star Rating

Wide Mouth Lid

The bottles are awesome and well made but these wide mouth caps are terrible. The plastic used for the strap is brittle and tears easily. I have torn threw 2 straps already just using that as a handle to carry the 40oz bottle. They need to use stronger/ more durable plastic for the ring and strap.

Posted by Kdawg on 01/06/2014

1 Star Rating

Awesome bottle, terrible cap.

This 64oz bottle is amazing for anyone! Although, the cap is awful. Just carrying it and the strap broke 6 days in. Awesome 64oz bottle - terrible lid.

Posted by Sam on 12/04/2013

1 Star Rating

Great Bottle, Terrible lid

I have had my 40 oz bottle for little over a year and love it! The lid however not so much I have gone through 4 lids since I got my bottle. The straps breaks or lid shatters if drop from anything above 2 feet. It is major defect thank god for the lifetime warranty.

Posted by Jeanne Niles on 12/01/2013

1 Star Rating

40oz bottle cap

Love the bottle! Hate the cap! This is my 4th cap in 6 months. Leaking, cracking, and strap breaking. Bottle is expensive but it lives up to your advertisements. My water stays ice cold all day. In fact most of the time I still have ice when I get home from work. You should provide free caps until you figure out how to resolve the problems.

Posted by Lani on 11/30/2013

1 Star Rating

check your seal

Check your seal of your cap really before you put it in your bag. I had a slightly defective cap that didn't show any signs of leaking until 20 mins later when I took it out and noticed that many of the contents of my bag were sticky and wet.

Posted by M. Bunker on 11/13/2013

2 Star Rating

Please improve this cap

This cap isn't rugged enough. I've accidentally dropped my insulated Klean Kanteen bottle and it handles the beating well. This cap broke after one drop from a height of 2 feet. A real bummer. Now I want to order a new one and it's out of stock... wonder why

Posted by S. Townsend on 11/12/2013

2 Star Rating


Don't like that I've been through two lids in a few weeks. I bought this great bottle because I work outside in the hot climate. I loved it...until after three weeks the strap that connects the lid to the bottle broke. I took it back and REI gladly gave me a new one. That one broke in two weeks. I have had Nalgene bottles for 5 years that I would even freeze and those have never broken. Don't get me wrong, the bottle is amazing but the lid is sub-par. Really unfortunate.

Posted by cf on 11/08/2013

2 Star Rating

could use some improvements

the plastic ring attaching the cap to the bottle broke within a few days of purchase, and then snapped off entirely a few weeks later. after about three months the rubber grip around the cap began to stretch and slip out of it's groove. otherwise very happy with the bottle in general.

Posted by PortlandHiker on 11/07/2013

2 Star Rating

cap is definitely the weak point of a great bottle

I purchased 2 40oz wide mouth insulated bottles and absolutely am sold--wonderful product. However, in 3 months I've gone through 2 caps. On one, the lanyard snapped for no apparent reason and the other cracked after what I would consider to be a fairly mild drop. For comparison, I know my Nalgene lid wouldn't have broken under the same stress. Still a great product--just redesign with a better lid system and we'll be good to go.

Posted by Daniel Jennings-Kam on 09/24/2013

5 Star Rating

just what I needed!

This is just what I needed after breaking my lid! Hydro Flasks are seriously the most amazing bottles for keeping hots hot and colds cold.

Posted by PT on 09/24/2013

5 Star Rating

Perfect replacement, easy to install

This was perfect when I broke the cap of my old bottle (it's very durable - I just dropped it on concrete multiple times - and despite being cracked, the grey rubbery seal around it still kept it from leaking). It was easy to remove the old ring and despite how easy it was to slip this one on, it still stays on securely.

Posted by joseph gallegos on 09/24/2013

5 Star Rating

awesome lid!

Fits like a glove .love it.I like that I can use it on all of my other wide mouth bottles

Posted by tomkat on 09/24/2013

5 Star Rating

flat cap

super cap just don't leave on top of truck and drive away then you wou't need a replacement cap they realy are strong

Posted by Janet on 06/15/2013

5 Star Rating

love it!

i love this lid! my drink doesnt spill even if i toss it in the diaper bag quickly...no leaks, everything stays hot/cold...LOVE LOVE LOVE i have 5 bottles total, 1 being a wide mouth with this lid

Posted by Jay in PA on 02/27/2013

4 Star Rating

The Perfect Lid...almost!

Just received the new flip lid for my 40oz wide mouth bottle, and it's perfect. I carry this bottle to work every day and have ice cold water all day. The reason my title said "The Perfect Lid...almost" is because the strap on the screw on lid was a perfect handle to carry the bottle by. If you guys could come up with a ring/handle that would work in conjunction with the flip lid, you would have The Perfect Lid! I currently have (2) 21oz bottles, (1) 40oz bottle, (1) 64oz Growler, and (1) 12oz food flask, love them all. They may seem expensive, but in reality they are a great value!