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Hydro Flask Standard Mouth Loop Cap - Standard Mouth

Select Color: Banana Yellow
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Select Color: Banana Yellow
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Need a replacement lid for your 12 oz or 21 oz Hydro Flask? We have you covered. The Standard Mouth Loop Cap is a leak-proof, vented cap that allows hot vapors to escape while closing the lid, ensuring a smooth and easy seal.

Perfect for everyday use, as well as the rigors of the outdoors, our caps aide in keeping your Hydro Flask contents hot or cold. The loop allows you to clip to a backpack or messenger bag and ensures your Hydro Flask stays with you wherever your adventure takes you.

The Standard Mouth Loop Cap is now available in new colors, too, as part of the Hydro Splash Line! Hydro Splash colors include Electric Blue, Banana Yellow, Limeade and Perfect Purple.

Our patent-pending loop caps are made from polypropylene PP#5 and are BPA-free.

Posted by Mercer on 03/18/2015

5 Star Rating

Best Water Bottle I've Found!

I am always carrying a water bottle. I used to use Nalgene and glass water bottles. I loved the size of the Nalgenes and the cleanliness of glass. This bottle provides the perfect combination of both. It is large enough to avoid having to refill constantly and it does not retain any tastes/smells as plastic does. This water bottle also keeps my water ice cold for several hours. Living in Arizona, water bottles usually heat up fairly quickly which leaves the water undrinkable. I left this water bottle in my car for hours and the water was still cold! Highly recommend!!

Posted by Scott on 03/18/2015

5 Star Rating


I bought myself one of these about a year ago as a birthday gift to myself. I have used it every day since for my morning coffee, and I have absolutely no complaints! I love it so much that I now have a water bottle and a true point on my radar to purchase in the very near future. Hands down the best travel mug I have ever owned!

Posted by Doug on 03/15/2015

5 Star Rating

Great Upgrade

I had been using another rugged water bottle for years and liked it fine but hated the water rings left behind wherever I set it down. After doing more research than I ever thought I would do for a water bottle, I purchased the Hydroflask. Rugged and solid construction with a nice finish. I was a little concerned about not having any splash guard, but to my surprise the shape of the bottle has a way of keeping ice at bay. Great bottle, absolutely recommend!

Posted by Andrew on 03/10/2015

5 Star Rating

Keepin' it Frosty

When your Dale's Pale Ale's gone stale, it's a bummer. These new pints from Hydroflask will make sure your brew stays as cool as your toes in a mountain river. I have some steel pints from other brands and I love the Hydroflasks way better. They don't get cold or hot to the touch when you fill them, and they do not sweat like others, while they keep your beer frosty for the whole 16 oz., even in the dog days of summer. I wish they had some more colors, and it'd be nice to see Hydroflask come out with an accessory lid. I love how they designed an inside lip at the bottom so you can stack these guys without them getting stuck on each other.

Posted by Bubba Jones on 03/09/2015

5 Star Rating


love it

Posted by Eric on 03/05/2015

5 Star Rating

Best drinking container ever

I've never had a drinking container that keeps cold drinks so cold for so long. No longer do I need to bring a cooler or freeze my drinks prior to heading to the beach! Lives up to it's claim. I've also never had a bottle that feels so solid, the caps do not leak at all, even the straw cap, and taking it to the pool it even floats when full of liquid!

Posted by Justin Shaver on 03/05/2015

5 Star Rating

A true beliver

I purchased my new Hydro Flask after hearing a co-worker rave about the two he has. I have had it over a week now and I can say that I'm a true believer. I filled it with ice at 0530 used it throughout the day till 1800 that night. To my amazement there was still ice in the flask. I have been made a believer in this product and will be purchasing a 12oz to use as my morning coffee container. Thank you for the wonderful products you make and I look forward to purchasing some as gift this year.

Posted by Lys on 03/05/2015

5 Star Rating

Use it every day.

I can't say enough great things about the Hydro Flask bottle and tell all my friends to buy one of their own. My coffee/tea stays a steady hot temperature throughout the workday. I can keep iced drinks cold for even longer, and the ice cubes survive so much longer than in other bottles. Perfect for a long bike ride or cold winter days.

Posted by Alyssa on 03/01/2015

5 Star Rating

Obsession with hydroflask.

My roommate and I collectively own 7 of these bottles. They are perfect for every occasion and work flawlessly. Our only complaint is that the liquids inside are too hot or too cold, which mean the product is exceeding at its job!

Posted by Hawaii on 03/01/2015

5 Star Rating


I got a hydro flask in recent months I can honestly say there is nothing like it. I go to school that is far from where I live so when I walk I need some refreshing water. So I decided to get myself a hydro flask. Best choice I have ever made. Why did I wait so long

Posted by Monroe Charles on 02/26/2015

5 Star Rating

Christmas Year Round

Got one of these for Christmas & it's like winter year round! I live in Hawaii, so warm to hot water is very normal if you leave your bottle in the car or even just sitting on a desk near a window. I was using a rival product & it was good, but the Hydro Flask is better! It's also a bit more manageable in size than my previous bottle. All up, definitely a fan for life. I use it every day now! Plus, Bend company! <3 Oregon.

Posted by Rob on 02/26/2015

5 Star Rating

Awesome Flask, excellent customer service

I bought this flask about 8 months ago and use it daily for work, among other things, always water. Keeps water cold all day with no problem. The best part? Although the cap ring broke, I submitted the warranty form and within minutes I received a notification that my replacement was being processed... awesome!

Posted by Kim Wolf on 02/25/2015

5 Star Rating

Homemaker, Health & Beauty Buyer at Healthy Alternative

I was given my wonderful large Hydro Flask from a rep at couple months ago & I have used it everyday since. I make a pot of my own tea blend every morning, fill my flask & refill my thermos that I keep out on the sales floor, all day long. EVERY TIME I re-open the flask for a refill, my tea is STILL piping hot. I absolutely LOVE it & I'm trying to get our owner to carry them in the store.

Posted by Ed on 02/24/2015

5 Star Rating


This is by far the best thermos I've owned. I have pretty much every model they've designed. My go to 40oz that I bought nearly three years ago is still going strong after numerous drops on the cement and trail and shows tons of character. Customer service is incredible. I've had to use them several times for replacement caps caused by my own carelessness and they have never given me any grief about sending a replacement.

Posted by Meggie on 02/23/2015

5 Star Rating

No problems lid is great.

I haven't had any problems with a leaky lid, have dropped my water bottle at least 5 times and it has survived. I totally recommend!

Posted by Diana Correia on 02/18/2015

5 Star Rating

I found the perfect water bottle!

I have been on the quest for a long time,in search for a water bottle that fits my lifestyle. I'm always on the go & when I leave the bottle inside a hot car for a long time it keeps the water/juice cold. I love it. It also does the same for hot coffee. We had many blizzards this year. When there was a threat of a power outage, I would brew my coffee,pour it in the growler and it was still warm the following morning. It was just awesome. Especially when theres no electricity due to these power outages. I used it so much I broke the cap at one point. Just the pice of plastic that attaches it to the growler. As promised, the life time warranty does work. I got my part in the mail with no hassles. Thank you!

Posted by Gina on 02/15/2015

5 Star Rating

Please give us other lids for this??

I really want this bottle but hesitate due to the narrow mouth opening and lack of lid choices. I have the wide mouth 18 oz and love it!! I would like this one because it holds more but please make it wide mouth so that my straw lid fits or make other lid options for this. Please, please!!

Posted by Jeremy on 02/14/2015

5 Star Rating

Best Bottle Ever

I live in the tropics of North Queensland Australia. I've had the 32oz wide-mouth for 2 months (during the peak of a hot and humid summer) and it is definitely the best water bottle I've ever had. Keeps cold a long time and doesn't sweat! The straw lid (which I use without the straw) makes it perfect!

Posted by Ben Jenkins on 02/12/2015

5 Star Rating

Best Bottle Around

I have tried hundreds of bottles and hydroflasks are the best around hands down. I work at a sporting goods store and we recently started stocking them. First I got the 32oz water bottle and I absolutely loved it. I couldn't believe how long the ice would last in the bottle. I like to stay hydrated and having to fill up the bottle 5+ times a day with water was beginning to be a hassle so I went ahead and got the growler. Yes this bottle is expensive but well worth the money. I found that with the growler it would keep the ice in there for even longer. I tested the 64oz growler by filling it to the brim with ice and water and let it sit capped on my blacktop driveway in 93+ degree weather too see how long the ice would stay frozen. Mind you this is the black growler as well. After 24 hours the ice had barely melted! After 72 hours there was still about the equivelant to a cube floating around in there. I have been using these two for about 3 months now and have found that they are large and heavy they are still the best bottle around. I recently also bought the 18oz wide mouth for hot tea and coffee this one is not near as good for cold items but perfect for keeping your coffee hot well through lunch. 18oz for hot beverages. 32oz for soda, juice, tea, mixed drinks or whatever, and 64oz for ice cold water for days. The perfect combo. Hydro4lyfe.

Posted by Caitlin McNeely on 02/11/2015

5 Star Rating

Best little water bottle ever!!!!!

I adore this thing, and I never thought I would feel that strongly about a water bottle! I got mine thru a third-party site and didn't realize it was for hot beverages, too, so once I discovered that, it really became my favorite thing that I owned! I take it with me everywhere and I find it's a much more livable size than bigger water bottles. It keeps my water nice and cold all through a hot yoga class and my hot chocolate HOT even hours later on an icy day...and yet its small, thin and always perfect to the touch. There are few things better than finding something so simple that is SO well designed. Thank You!

Posted by Jack McCabe on 02/10/2015

5 Star Rating

Home Builder

64 oz. Hydro Flask is the best tool i have. Cold water all day. I have tried them all this is the best ever.

Posted by Charlie Baker on 02/09/2015

5 Star Rating


It is the absolute best yes BEST!!!!!

Posted by Adam R. on 02/07/2015

5 Star Rating

Hydro Flask is Awesome!!!

Bought my Hydro Flask because my girlfriend has one and loves how it keeps her water icy cold for hours on end. I have to say this is the best water bottle I have ever had of any brand! It definitely keeps my water with fresh lemon wedges ice cold, exactly the way I like it. Definitely makes it easier for me to make sure I drink enough water every day. I have not yet tried putting hot tea or coffee in it, but I definitely will as I know it will stay piping hot just as well as it keeps my water cold. Great product Hydro Flask!

Posted by Jay Garcia on 02/01/2015

5 Star Rating

So Far So Good

I have been using my 40oz Hydroflask for a year now and so far everything on it is perfect. I have keep it strapped to my backpack with a carabiner from day one and it has lasted through plane flights, backpacking, constant daily use and misuse.

Posted by Don on 02/01/2015

5 Star Rating

Sure are a bunch of whiney humans writing reviews..

I've owned and used daily my 18oz flask with a widemouth flip lid for the past year and half. With the 360 days of eternal winter we have in Vermont, it usually has hot tea in it. It has worked better than advertised the entire time. The best part of this cup/lid is that i can fill it up, screw the cap on tight, snap the lid and put it in my bag without worrying about spills. After 540 days of continuous use the snap lid is starting leak a bit when I shake/mix my tea. But i am not complaining, given an understanding of design and material life spans. Hydroflask hit the hot/cold reusable container ball out of the park. In my humble opinion.

Posted by Julian Greig on 01/28/2015

5 Star Rating

10/10 Would buy again!

I have the 32oz. Wide worth and it's awesome! About to get more for just tea, and one for my girlfriend as well. I highly recommend this product for anyone whom likes to stay well hydrate throughout the day.

Posted by Leah on 01/24/2015

5 Star Rating


My Grandparents gave this to me for Christmas and it is the best water bottle I have ever owned. I use it every day and fill it up about twice a day. It's a little larger than most so if you are looking for convenience then I would say get a smaller size. But if you are looking for a lot of water, keeping it cold all day, great durability and looks, then this is your bottle!

Posted by Y0LLIE on 01/23/2015

5 Star Rating


There are plenty of negative comments about the lids. That has not been my experience. Actually I drink water with Crystal Light & ice. I turn my Hydro Flask upside down to shake it. Not once did I have a leak. My advice to those with leaking lids, make sure you have screwed the cap on tight and when you open the flip top to drink it snaps in place. No leaks people.

Posted by Y0LLIE on 01/23/2015

5 Star Rating


I have purchased 3 of these now. I take one to hot yoga and use the other one at work. I like drinking cold water throughout the day as that is the ONLY way I will drink water. Do these really keep my water cold Hell yeah. I also have a 12oz I like to keep by my bed side for when I wake up parched in the middle of the night or in the morning. These Hydro Flasks have been a life saver.

Posted by Leslie on 01/23/2015

5 Star Rating

18 oz hydro flask wide mouth

I got this for christmas from my son and I absoultely love it!! I love my coffee almost to the boiling state and I can honestly say for me this has worked. The first time i used it I didnt drink my coffee for over 30 minutes after I poured it in the flask, it was still hot, in fact up to a hour or so later it was still very hot. I found out that once hot it stays hot for at least 2 hours from my usage. I would highly recommend this. I have not used it for cold yet but the hot feature has impressed me greatly. The only issue I have come across is that the seal seems to fall out sometimes.