

💧 Sip smart, stay unstoppable with Hydro Flask.
The Hydro Flask Standard Mouth Flex Cap Bottle is a 21 oz stainless steel reusable water bottle featuring TempShield vacuum insulation that keeps beverages cold for 24 hours and hot for 12 hours. Its leakproof Flex Cap and durable 18/8 pro-grade stainless steel construction ensure reliable, flavor-free hydration on the go. Designed with a comfortable Flex Strap and a dishwasher-safe Color Last powder coat, this BPA-free, toxin-free bottle fits most cup holders and backcountry filters, making it the perfect companion for busy professionals who value style, sustainability, and performance.




| ASIN | B08RLD5QLW |
| Age Range (Description) | Adult |
| Base Diameter | 2.85 Inches |
| Best Sellers Rank | #268,231 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3,988 in Water Bottles |
| Brand | Hydro Flask |
| Brand Name | Hydro Flask |
| Cap Type | Sports Cap |
| Capacity | 21 Fluid Ounces |
| Color | Carnation |
| Country of Origin | China |
| Customer Reviews | 4.8 4.8 out of 5 stars (12,756) |
| Date First Available | December 29, 2020 |
| Included Components | bottle, lid |
| Is Dishwasher Safe | Yes |
| Item Dimensions LxWxH | 1.12 x 1.12 x 4.37 inches |
| Item Package Dimensions L x W x H | 10.16 x 3.31 x 3.23 inches |
| Item Weight | 11.3 Ounces |
| Manufacturer | Hydro Flask |
| Material | STEEL |
| Model Name | 21 OZ STANDARD FLEX CAP |
| Model Year | 2021 |
| Number of Items | 1 |
| Outer Material | Stainless-Steel |
| Package Weight | 0.42 Kilograms |
| Part Number | S21SX622 |
| Pattern | Bottle |
| Product Care Instructions | Hand Wash Only |
| Product Dimensions | 1.12"W x 4.37"H |
| Recommended Uses For Product | Water |
| Size | 21 Ounces |
| Special Feature | Cold 24 Hours, Dishwasher Safe, Leak |
| Sport Type | Multi-Sport |
| Style | 21 Oz |
| Suggested Users | unisex-adult |
| UPC | 810028842373 |
| Warranty Description | LIFETIME |
| With Lid | Yes |
K**L
Awesome water bottle. Highly recommend!
Awesome water bottle. Highly recommend!
C**E
Stylish and Reliable, lifetime warranty: Hydro Flask Standard Mouth 21 oz Bottle with Flex Cap
This bottle comes with a manufacturer’s lifetime warranty. I’m thrilled. The Hydro Flask Standard Mouth 21 oz bottle is a fantastic addition to my daily routine. Its vibrant color adds a pop of personality, while its sleek design makes it a stylish accessory wherever I go. One of the best features of this bottle is its leak-proof design. I can toss it into my bag without worrying about any spills or leaks, which gives me peace of mind during my busy days. Additionally, its stainless steel construction ensures durability, making it a reliable companion for all my adventures. Another highlight is its ability to maintain the temperature of my beverages. Whether I fill it with ice-cold water for a hike or piping hot coffee for my morning commute, the Hydro Flask keeps my drinks at the desired temperature for hours on end. Plus, the fact that it’s dishwasher safe is a huge convenience. I can easily clean it after each use without any hassle. Overall, I highly recommend the Hydro Flask Standard Mouth bottle to anyone looking for a stylish, reliable, and functional drinkware option.
N**.
Love it
I really liked this water bottle. It stays cold for some time but I have seen more bottles that stay cold longer, still pretty good though. The color pops and it's easy to carry with the bendy handle. This hydro flask does not leak at all. I really do suggest that you buy a water bottle boot (the silicone things that slip on the bottom of the bottle to protect from scratches, dents, etc.) to go with it because if you don't this bottle can get scratched up easily, which is what happened to mine. Also , it's very easy to clean and holds a good amount of water at a time! Overall, this bottle is amazing and fun.
C**D
Awesome water bottle that everyone needs to purchase...SAVE OUR PLANET
Our family has been trying to do their part to reduce our waste and clean up the earth. Getting rid or reducing the use of plastic bottles should be a law soon! This water bottle can hold almost 1.5 bottles of water if you compare it to a typical plastic water bottle. This is my second hydro flask water bottle and it is by far the best one on the market. I usually leave it in the freezer overnight (without the cap) if I know I will be out all day in the hot sun and it keeps it cold allllll day. If you can't throw it in the freezer just throw some ice cubes and it works just as good. The materials feel very solid and its super easy to clean. It has not leaked at all and we use it daily. Just one thing I did drop it on the concrete from about should height and it did get a dent on the bottom but it still functions the same.
E**N
The BEST product out there in terms of keeping your Water Cold!
I rotate several sizes and colors at my side, when I am in the car, etc so it's Easy to Remember to Drink my Daily Water & it's useful when I take my daily meds throughout the day. I use the largest one for only Ice; the smaller ones get filled with bottled water & ice. As the day goes into early evening, I refill with Ice & water, and I am good to go. They make the Best AND Appreciated Gifts because they WORK, DON'T Spill, Keep liquids COLD & the different colors are fun & amazing! I always order the top separately with a mouthpiece, & they always include a Brush that makes Cleaning a Breeze!
C**Y
It's okay
Arrived in perfect condition. Wish that the company would make a straw lid for the 24oz as I had to order that separately from another company. As far as durability, it feels fragile! As if it will dent or scratch if I knock it over or set it down too hard. It is very lightweight and the bottom does scratch easily. Otherwise, keeps water cold and fits in my car's cup holders!
F**N
My best drink bottle!!
I bought the 21 oz size bottle. This bottle keeps it cooler than I expected. The iced drink I put in the day before was still cold the next morning. I was really surprised. This bottle is large enough to hold a plastic bottle drink plus ice. It's fun to be able to choose your favorite color. Also, the mouth area of this bottle is very soft on my lips. It is comfortable to drink from this bottle.
S**B
Keeps water cold for days. Worth every penny!
I'll be honest, I wanted to know why people would spend so much money on a water bottle. Until I tried one. You cannot afford to waste your money on any other water bottle. The fact they make replacement parts for these bottles is even better because you can swap out lid styles and replace parts if you lose them. The water on a 90 degree day is ice cold after hours of laying in the sun at spring events. You should try it for yourself. You will never want to use another water bottle again.
L**.
Eine langlebige Flasche, die schadstofffrei ist und in die Spülmaschine darf. Und man kann im Sommer kaltes Wasser genießen oder im Winter Tee, wenn man denn möchte. Durch die große Öffnung trinkt man mehr wie aus dem Glas als aus einer klassischen Flasche. Gefällt mir ebenfalls. Sehr hochwertig sowohl die Flasche selbst als auch der Verschluss.
L**.
My daughter loves her hydro flask! It’s great quality and a fab colour. Although more expensive than some other flasks it doesn’t leak and her drinks stay very cold
A**R
This is a great bottle! It does what it says - keeps things piping hot for 4 hours (I haven't tested it with cold contents yet), its easy to clean and it fits into the side pocket of my small-ish backpack (note: the wide mouth 1litre version definitely does not - just in case you are deciding between the two options). I think the color in reality is a little less purple than in the photos - its very subtle. I already dropped it quite violently from my kitchen counter onto the tile floor and it only left a teeny-tiny dent that you almost can't see (I would have expected much more damage). And the best is that there is no metallic taste at all when used for drinking water out of it!
K**N
Bought it for my granddaughter as a Christmas present she loved it
J**N
Keeps the water cold for hours
Trustpilot
4 days ago
3 weeks ago