---
product_id: 667394343
title: "21 Oz Standard Mouth Flex Cap Moonshadow"
brand: "hydro flask"
price: "A$101"
currency: AUD
in_stock: true
reviews_count: 5
category: "Hydro Flask"
url: https://www.desertcart.com.au/products/667394343-21-oz-standard-mouth-flex-cap-moonshadow
store_origin: AU
region: Australia
---

# Leakproof seal 12h hot retention 24h cold retention 21 Oz Standard Mouth Flex Cap Moonshadow

**Brand:** hydro flask
**Price:** A$101
**Availability:** ✅ In Stock

## Summary

> 💧Hydrate like a pro, stay fresh all day long!

## Quick Answers

- **What is this?** 21 Oz Standard Mouth Flex Cap Moonshadow by hydro flask
- **How much does it cost?** A$101 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/667394343-21-oz-standard-mouth-flex-cap-moonshadow)

## Best For

- hydro flask enthusiasts

## Why This Product

- Trusted hydro flask brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Perfectly Portable:** 21 oz size fits cupholders and backpacks seamlessly—hydration that moves with you.
- • **Leakproof Confidence:** Secure flex cap ensures no spills or leaks, perfect for your daily commute or gym bag.
- • **Zero Flavor Transfer:** Enjoy pure, untainted taste every sip—no metallic or residual flavors.
- • **Adventure-Ready Durability:** Crafted from tough stainless steel that withstands your busiest days and wildest hikes.
- • **Stay Chill or Sizzle All Day:** Keeps beverages icy cold for 24 hours or piping hot for 12 hours with TempShield️ double-wall vacuum insulation.

## Overview

The Hydro Flask 21 Oz Standard Mouth Flex Cap in Moonshadow Purple features TempShield️ double-wall vacuum insulation that keeps drinks cold for 24 hours and hot for 12 hours. Made from durable stainless steel, it offers leakproof performance and pure taste with no flavor transfer. Its 21 oz capacity and cupholder-compatible design make it the ideal hydration companion for busy professionals and outdoor enthusiasts alike.

## 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.

Review: オシャレでカワイイし結構冷たいのも長持ちしてました！表面が細かく凸凹してるのも持ちやすくていいです。
Review: After 6-9 months of light use, my Hydroshield water bottle is a major disappointment, looking as though it's "come out of a warzone." The primary issue is its abysmal durability and finish. The paint has not held up too well at all, chipping and flaking all over. Furthermore, the bottle dents very easily and is covered in scratches all over, which quickly makes it look old and heavily used. For a reusable bottle, this lack of resilience and poor finish quality is simply unacceptable. Based on this experience, I strongly suggest you look at buying something different if you want a water bottle that can withstand the rigors of everyday life.

## Features

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Hydro Flask |
| Model Number | 840394203737 |
| Color | Moonshadow Purple |
| Product Dimensions | 14.61 x 14.61 x 22.86 cm; 340 g |
| Capacity | 1 Fluid Ounces |
| Material | Stainless Steel |
| Special Features | Vacuum Insulated |
| Item Weight | 340 g |

## Product Details

- **Brand:** Hydro Flask
- **Capacity:** 1 Fluid Ounces
- **Colour:** Moonshadow Purple
- **Recommended uses for product:** Water
- **Special features:** Vacuum Insulated

## Images

![21 Oz Standard Mouth Flex Cap Moonshadow - Image 1](https://m.media-amazon.com/images/I/61eFEyzPSHL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by ひ***ば on 19 October 2025*

オシャレでカワイイし結構冷たいのも長持ちしてました！表面が細かく凸凹してるのも持ちやすくていいです。

### ⭐⭐ Review
*by T***Q on 26 October 2025*

After 6-9 months of light use, my Hydroshield water bottle is a major disappointment, looking as though it's "come out of a warzone." The primary issue is its abysmal durability and finish. The paint has not held up too well at all, chipping and flaking all over. Furthermore, the bottle dents very easily and is covered in scratches all over, which quickly makes it look old and heavily used. For a reusable bottle, this lack of resilience and poor finish quality is simply unacceptable. Based on this experience, I strongly suggest you look at buying something different if you want a water bottle that can withstand the rigors of everyday life.

### ⭐⭐⭐⭐⭐ Review
*by M***S on 4 July 2023*

I love Hydroflasks! I bought this to replace one that I had been using daily for years. The old one had taken a real beating! It had several dents, and the coating was starting to chip just a bit. I love my new one! Same great Hydroflask quality and vibrant color! I really like the top which is easy to loop a finger or two though for carrying! It also fits well into my car's cupholder and the cupholder of my day pack!

## Frequently Bought Together

- Hydro Flask - Water Bottle 621 ml (21 oz) - Vacuum Insulated Stainless Steel Water Bottle with Straw Cap - BPA-Free - Standard Mouth - Moonshadow, Fossil
- Hydro Flask - Flex Straw Cap for Standard Mouth - Leakproof - Honeycomb Insulated Cap with Flex Strap for Easy Carrying - BPA-Free and Toxin-Free - Dishwasher Safe - Black

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**Shop now:** [https://www.desertcart.com.au/products/667394343-21-oz-standard-mouth-flex-cap-moonshadow](https://www.desertcart.com.au/products/667394343-21-oz-standard-mouth-flex-cap-moonshadow)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-21*