Skip navigation

Get your holiday gifts in time! Order by 11:59pm PT on 12/17 for standard shipping. Shop Gifts

0
Main content
  1. Home
  2. Women

21oz. Standard Flex Cap Flask

Hydro Flask

SOLD OUT

This item is no longer available. Browse our recommendations for something similar.

Details & care

Keep life moving with the 21 oz Standard Mouth Bottle with Flex Cap. It stashes easily into a small shoulder bag, your packs side pocket, or your car cup holder, and holds enough ice-cold goodness to keep you going for hours without weighing you down. No wonder it's one of Hydro Flasks bestselling water bottles! TempShield insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Versatile, middle-of-the-road size. Durable 18/8 Pro-Grade Stainless Steel construction. BPA-Free and Phthalate-Free. Compatible with Standard Mouth Insulated Sport Cap. Lifetime Warranty.

  • 21oz. capacity
  • Stainless steel, polypropylene
  • Dishwasher safe
  • Imported
  • Item #6945198

Gift options

Write a gift message at Checkout and we'll email it to the recipient when their item is delivered.
Need help finding the perfect gift? We've got you covered.
Shop Gifts

Hydro Flask

Headquartered in Bend, Oregon, Hydro Flask launched the first all-insulated bottle in 2009 and has spent the last 10 years delivering on its commitment to save the world from lukewarm.

Reviews

(1177)
4.6 out of 5
Write a Review
Fit: True to size
Width: True to width

Most helpful positive review

Dec 9, 2025
Great bottle
[This review was collected as part of a promotion.] I love this bottle. It’s no too large and has a comfortable carrying handle.
Tina W.
Reposted from hydroflask.com

Most helpful critical review

Apr 23, 2025
Avoid - abort- do not buy
[This review was collected as part of a promotion.] Awful. Got the “leak proof” item and it leaks all the time. Followed the instructions double checked everything. Hydro does not do returns or refunds, once you find the product is garbage they say too bad, it is used.
Don C.
Reposted from hydroflask.com

Customer photos

Add your photo & review

Share your photo to help other shoppers.

5 stars
82%
4 stars
9%
3 stars
3%
2 stars
3%
1 star
3%
Sort by Most Helpful
Tina W.
Reposted from hydroflask.com
Dec 9, 2025
Great bottle
[This review was collected as part of a promotion.] I love this bottle. It’s no too large and has a comfortable carrying handle.
Sheila S.
Reposted from hydroflask.com
Dec 7, 2025
Great purchase!
[This review was collected as part of a promotion.] My Hydro Flask stays cold/hot for hours and looks so sleek.
Claire R.
Reposted from hydroflask.com
Dec 4, 2025
Great quality and super fast!
[This review was collected as part of a promotion.] We are very happy with this purchase for our company gifts!
Barbara B.
Reposted from hydroflask.com
Oct 6, 2025
Small opening
[This review was collected as part of a promotion.] Love it except the opening is very small … I need to get a different lid so I can drink out of it better. Next time I will pick a different style. .
Skyla G.
Reposted from hydroflask.com
Aug 29, 2025
Hydra flask
[This review was collected as part of a promotion.] The best product and aloe is the nicest color. Thank you so much.
Eugene K.
Reposted from hydroflask.com
Aug 12, 2025
Hydro Flask bottles are great!
[This review was collected as part of a promotion.] We have used Hydro flask bottles for almost 10 years. They are solid, leap, proof, insulated, and good looking. The dents and dings they earn on our adventures, only make them more attractive. Hydro Flask are at the top of the class.
Load 6 more reviews