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Hydro Flask

Hydro Flask Standard Flex Cap White 18 Oz

  • Based on 10,033 reviews
Condition: New
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$24.10 Why this price?
Holiday Deal · 20% off was $29.95

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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Nov 18
Order within 12 hours and 29 minutes
Available payment plans shown during checkout

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Style: 18 Oz


Color: White


Features

  • 24 hours cold, 12 hours hot
  • TempShield double-wall vacuum insulation
  • Leakproof when closed
  • Pure taste, no flavor transfer
  • Durable stainless steel
  • BPA-Free
  • Dishwasher safe
  • Not for use on a stove, in a microwave or freezer
  • Keep hot liquids out of the reach of children
  • water bottle, leakproof, insulated, 24 hours cold, 12 hours hot, dishwasher safe, 18 oz, cupholder compatible

Description

Stainless steel, cupholder compatible, fits anywhere—the compact, reusable, refillable Standard Mouth insulated water bottle keeps cold drinks cold for 24 hours, hot drinks hot for up to 12 hours, and holds enough hydration for quick adventures.

Brand: Hydro Flask


Capacity: 18 Fluid Ounces


Color: White


Recommended Uses For Product: Water


Special Feature: Straw, dishwasher safe, double wall, leak-proof, insulated, leak-proof


Brand: Hydro Flask


Capacity: 18 Fluid Ounces


Color: White


Recommended Uses For Product: Water


Special Feature: Straw, dishwasher safe, double wall, leak-proof, insulated, leak-proof


Age Range (Description): Adult


Product Dimensions: 1.12"W x 4.06"H


Model Name: 18 OZ STANDARD FLEX CAP


Item Weight: 21.95 g


Material: STEEL


Number of Items: 1


Pattern: Plain-Coloured


Included Components: bottle, lid


Product Care Instructions: Dishwasher safe


Base Diameter: 2.8 Inches


Cap Type: Flex Cap


With Lid: Yes


Is Dishwasher Safe: No


UPC: 810497025581


Manufacturer: Hydro Flask


Global Trade Identification Number: 81


Item Weight: 0.774 ounces


Department: teen-boys


Item model number: S18SX110


Is Discontinued By Manufacturer: No


Date First Available: March 31, 2013


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 18

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • The perfect everyday water bottle
Style: 24 Oz Color: Black
Review Image by Daniela González Daniela González
Review Image by Daniela González Daniela González
I’ve had this bottle for several years now, and I can confidently say it’s one of the best I’ve ever owned. It keeps drinks cold for hours, even in extremely hot weather, and it also keeps beverages hot long enough. The material is durable, but I still recommend getting the silicone flex boots for protection, since it scratches and dents easily with bumps. The size is perfect for fitting into backpack pockets and for travel. I also recommend this type of lid over others, since it never leaks and keeps drinks at the right temperature. ... show more
Reviewed in the United States on September 29, 2025 by Daniela González Daniela González
    • Love Zulu H2O bottles!
Style: 24 Oz Color: CASCADE
Perfect metal water bottle! It has a handle, fits in the car holder, easy to clean, nice color , holds ice cold temperature well, has a good drinking spout, good value for the price and seems to be leak resistant. If only my husband stops losing them - this is Zulu number 3.
Reviewed in the United States on August 4, 2025 by nikroh
    • Great water bottle
Style: 24 Oz Color: CASCADE
I love it, it's my daily water bottle. Keeps water cold, easy to clean and not heavy
Reviewed in the United States on October 18, 2025 by Maria Teresa Terrazas Cruz
    • Best water bottle ever!
Style: 18 Oz Color: White
This is my favorite water bottle of all times. Had another one, but left it on a plane. Immediately replaced it. This is the right size, easy to open, and easy to fill, including adding ice. Love this bottle. Holds enough water but not so much that it weighs too much. Well made, secure seal. Fits my backpack well, and also in the well of my car. LOVE IT! ... show more
Reviewed in the United States on August 25, 2025 by Susan Arnett
    • Great container
Style: 21 Oz Color: CASCADE
Excellent water container, keeps contents at desired temperature For a very long time. Quality made, great price and delivered quickly
Reviewed in the United States on September 19, 2025 by Amazon Customer
    • Keeps water cold for a little and dents easily
Style: 18 Oz Color: White
The water bottle is fine, it’s easy to use and aesthetically pleasing. My only issue is how easy it dents. I dropped it once and there is a huge dent, my other water bottles do not do this. Other than that, it keeps my water cold and works well.
Reviewed in the United States on August 24, 2024 by L.D.
    • Perfect Size
Style: 24 Oz Color: Black
This hydro flask is perfect for business travel. It fits easily in a side pocket of a backpack and fits the perfect amount of water during flights. The lid is secure and does not leak. The water also stays cold for a long time.
Reviewed in the United States on September 15, 2025 by Matthew Petrie
    • Perfect
Style: 24 Oz Color: Black
Nice size, good seal, easy to clean super basic and reliable like a swiss army knife this is the best water bottle unlike others that have straws and other stuff that are inpossible to thouroughly coeaj for bacteria. Little too narrow to fit a sponge and wash it that way but rubbing alcohol works fine . ... show more
Reviewed in the United States on September 21, 2025 by eric

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