Search  for anything...
Hydro Flask

Hydro Flask 21 Oz Standard Mouth Flex Cap Moonshadow

  • Based on 87 reviews
Condition: New
Checking for the best price...
$49.99 Why this price?

Buy Now, Pay Later

As low as $8.33 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

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.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 1 left in stock, order soon!
Fulfilled by SG37 Sales
Arrives Monday, Nov 2
Order within 16 hours and 9 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style: 21 Oz


Color: Moonshadow Purple


Features

  • 24 hours cold, 12 hours hot
  • TempShield double-wall vacuum insulation
  • Leakproof when closed
  • Pure taste, no flavor transfer
  • Durable stainless steel

Description

Stainless steel, cupholder compatible, fits right in your pack—the reusable, refillable 21 oz 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 hours of fun.

Brand: Hydro Flask


Capacity: 621 ml


Color: Moonshadow Purple


Recommended Uses For Product: Water


Special Feature: Vacuum Insulated


Brand Name: Hydro Flask


Recommended Uses For Product: Water


Age Range Description: Adult


Model Name: Standard Mouth Flex Cap Bottle


Included Components: Bottle


UPC: 840394203737


Manufacturer: Hydro Flask


Global Trade Identification Number: 37


Item Type Name: Water Bottle


Unit Count: 1 Count


Manufacturer Warranty Description: LIFETIME


Capacity: 621 ml


Item Dimensions W x H: 5.75"W x 9"H


Item Weight: 0.34 kg


Number of Items: 1


Additional Features: Vacuum Insulated


Cap Type: Flex Cap


Material Type: Stainless Steel


Product Care Instructions: Hand Wash Only


Color: Moonshadow Purple


Pattern: Solid


Theme: Sport


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Nov 2

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
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Stay hydrated my friends
Style: 21 Oz Color: Moonshadow Purple
Nice size water bottle, especially for travel. I always buy a water bottle after security and add it to the bottle to take on the plane with me. No leaks and keeps the water cold. I add stickers to all the places I travel
Reviewed in the United States on June 16, 2025 by AmazonGirl
    • Good Bottle
Style: 21 Oz Color: Moonshadow Purple
It holds water and is a pretty color. Semi-flexible handle makes for easy carrying.
Reviewed in the United States on July 1, 2025 by Dylan
    • Dishwasher safe and no leaking!
Style: 21 Oz Color: Moonshadow Purple
These are the best water bottles. They do not leak even after tossing in the dishwasher after every use. They keep water so cold. I refrigerate several and always have one to grab and go..
Reviewed in the United States on May 29, 2025 by suparo
    • Great water bottle
Style: 21 Oz Color: Moonshadow Purple
Loving this water bottle. The handle makes carrying it everywhere easy!
Reviewed in the United States on May 15, 2025 by WAD
    • Love my Hydro Flask!
Style: 21 Oz Color: Moonshadow Purple
Great water bottle in my favorite color and the size fits great in a backpack mesh side pocket. No leaks either.
Reviewed in the United States on May 6, 2025 by Antoinette
    • Great quality everyday bottle
Style: 21 Oz Color: Moonshadow Purple
Review Image by kathy-ann springer kathy-ann springer
Review Image by kathy-ann springer kathy-ann springer
Review Image by kathy-ann springer kathy-ann springer
The media could not be loaded. I am very happy with my purchase, it was well packaged. The design is very nice and I love the color I chose. Definitely leak proof and there aren’t any dents. Easy to open and great functionality, I take it to work, gym or if I’m just heading out for the day. I also bought a small bottom boot which is silicone to protect it from getting bump at the bottom of the bottle and a standard flex straw cap to use more so when I’m going to the gym. ... show more
Reviewed in the United States on December 8, 2024 by kathy-ann springer kathy-ann springer
    • Favorite water bottle!
Style: 21 Oz Color: Moonshadow Purple
Best water bottle I ever had. Easy to clean. Keeps water cold and fresh. No leaking!!
Reviewed in the United States on June 10, 2025 by Jody R.

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...