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Hydro Flask Wide Mouth 40 oz Stainless Steel Bottle with Flex Cap1 / 6
Product guide

Hydro Flask Wide Mouth 40 oz Stainless Steel Bottle with Flex Cap

Hydro Flask Wide Mouth is a 40 oz stainless steel water bottle with a flexible-handle Flex Cap. The listing claims double-wall vacuum insulation for cold drinks up to 24 hours and hot drinks up to 12 hours, and says the cap is leakproof when closed.

At a glance

  • Double-wall vacuum insulation is claimed to keep drinks cold for up to 24 hours or hot for up to 12 hours.
  • The flexible cap handle gives you a grab point for carrying the bottle.
  • The listing describes the Flex Cap as leakproof when closed.
  • Bottle and lid are listed as dishwasher safe.
  • Manufacturer copy says the bottle is not for use on a stove, in a microwave or freezer.
Price
$46.47Save 22%

Reference price: $59.95

Price checked: Nov 13, 2026

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Often bought together

Pros and cons

Pros

  • Large 40 oz format suits buyers who want fewer refills.
  • Dishwasher-safe care is stated for both bottle and lid.
  • The wide mouth is described as fitting ice cubes and compatible with Wide Mouth caps and lids.

Technical specifications

11 specifications
Identity
BrandHydro Flask
ModelWide Flex Cap
ColourCapri Blue
Recommended useWater
Age rangeAdult
Dimensions and weight
Dimensions (W × H)9W x 32.3H centimetres
Weight listed0.44 kg
Materials and care
Material listedStainless Steel
CareDishwasher Safe
Insulation and closure
Temperature retention claimCold 24 Hours, Hot 12 Hours
Closure claimLeakproof when closed

What to know before buying

  • The capacity is identified as 40 oz in the title and product copy, but a separate details field labels capacity as 1.13 kg, which is a mass unit. Treat the size as the title's 40 oz claim and check the selected listing if exact capacity matters. The advertised insulation durations are manufacturer claims, not independently verified results. Use the bottle only as directed. Keep hot drinks out of children's reach and do not use it on a stove, in a microwave or freezer.

What’s in the box

Included
  • Water Bottle

Who is it for?

A good fit for

  • People who want a high-capacity insulated water bottle for everyday hydration.
  • Buyers who prefer a wide-mouth opening for adding ice and a cap handle for carrying.
  • Those who want a dishwasher-safe bottle and lid.

Less suited to

  • Anyone who needs a bottle confirmed safe for a stove, microwave or freezer.
  • Buyers seeking customer feedback without reported concerns about rusting, staining, durability or leakage.
Hydro Flask Wide Mouth 40 oz Stainless Steel Bottle with Flex Cap · photo 2
Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 354 ratings
  • 5 stars77%77%
  • 4 stars9%9%
  • 3 stars7%7%
  • 2 stars2%2%
  • 1 star5%5%

Customer feedback describes good perceived quality, cold-water retention, colour and appearance. Some customers report rusting around the lip and quick staining, while durability and leakage experiences are mixed. Those concerns matter for a bottle advertised as leakproof when closed and intended for repeated use. The feedback is consistent with interest in its claimed insulated design, but does not independently establish its performance.

Positive themes

  • Customers report good perceived quality and appreciate the colour and appearance.
  • Customers describe water staying cold and ice lasting for hours.

Negative themes

  • Some customers report rusting around the lip and staining quickly.

Mixed feedback

  • Customer feedback describes mixed experiences with durability and leakage.

Frequently asked questions

How long does the listing say drinks stay cold or hot?

It claims cold retention for up to 24 hours and hot retention for up to 12 hours. These are manufacturer claims, not independently verified performance.

Is the Flex Cap leakproof?

The listing says the cap is leakproof when closed. Customer feedback also describes mixed experiences with leakage.

Can the bottle go in a dishwasher?

The listing says the bottle and lid are dishwasher safe.

Can it be used in a microwave or freezer?

No. The manufacturer copy says not to use it on a stove, in a microwave or freezer.

Hydro Flask Wide Mouth 40 oz Stainless Steel Bottle with Flex Cap · photo 3
Additional product photo 3

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Product details in Markdown