Super Sparrow Stainless Steel Vacuum Flask Review

You’re here on we can assume you love exploring the great outdoors, be that hiking, camping, wild swimming, bush crafting, kayaking, rafting etc, then you will probably own a flask! I have a few but I’m always on the hunt for a solid flask that can take a liking and keep on kicking, to help keep me fueled and hydrated on my adventures. Recently, I got my hands on the Super Sparrow Stainless Steel Vacuum Flask, so let’s see if it can handle a adventure.

Product: Sparrow Stainless Steel Vacuum Flask

Price: £30 

Verdict: 9/10 

Short Description: A solid flask for most adventures.

Pros: Wide mouth, twist/pour stopper, great temperature retention.

Cons: Possibly a clip for more transportation options.

To Buy:

Stainless Steel Water Bottle Construction

We will start this vacuum flask review with the materials. It is solid, built to last and made from premium 18/8 medical-grade stainless steel, this water bottle is built to last through all your rugged outdoor exploits. Simply put, 18/8 medical-grade stainless steel means durability, rust resistance, and food-grade quality. I have dropped it a few times and it is still here, it is robust! Unlike some cheaper bottles or glass flasks that would have shattered! Its durable stainless steel construction shrugs off dings and drops that would sideline other bottles.

Flavourless Perfection

Some cheaper, low-quality metals and plastics can impart a plasticky or metallic flavour, the Super Sparrow keeps your beverages tasting crisp and clean thanks to its medical-grade stainless steel, BPA-free, chemical-free construction, with no microplastic contamination here.

Black coffee, contained in the insulated flask for four hours prior to my first coffee tasted just like coffee from my favourite cup at home.

Glass vs. Stainless Steel Vacuum Flasks: Pros and Cons

Ok, for those not in the know. Here is a 101 of the two major thermos flasks used by outdoors enthusiasts. 

Glass Vacuum Flasks


Pure Taste: Glass does not impart any flavours or odours to your drink, ensuring a pure taste experience.
Easy to Clean: The smooth, non-porous surface of glass is easier to clean thoroughly and resist stains.
Chemical-Free: Glass is inert and does not leach chemicals into the liquid, making it a healthier option.


Fragility: Glass is more prone to breakage upon impact, making it less durable for outdoor activities or travel.
Heavier: Glass flasks are generally heavier than stainless steel, making them less convenient to carry around.
Lower Temperature Retention: Glass flasks may not retain temperature as long as stainless steel flasks due to lower insulation properties.

Stainless Steel Vacuum Flasks


Durability: Stainless steel is highly durable and resistant to dents, scratches, and breakage, making it ideal for outdoor adventures and travel.
Lightweight: Stainless steel flasks are lighter than glass flasks, making them easier to carry around.
Superior Temperature Retention: The double-walled construction and vacuum insulation of stainless steel flasks provide excellent temperature retention for both hot and cold beverages.
Variety of Designs: Stainless steel flasks come in a wide array of colours, finishes, and designs to suit personal preferences.


Potential Flavor Transfer: Some users report a slight metallic taste in beverages stored in stainless steel flasks, particularly if the liquid is acidic or stored for a long time. I have never experienced this myself.
Difficult to Clean: The narrow opening of some stainless steel flasks can make cleaning challenging, particularly if there is residue buildup. Not with this Super Sparrow flask, it is a wide boy!

So, for us outdoor enthusiasts, stainless steel is the way forward, OK, now let’s get back to the review.

A Rugged Thermo Flask That Is Vacuum Insulated

Next, let’s look at this bottle’s insulation capability. The double-walled vacuum insulation is no joke – real-world testing: it kept my ice water frosty cold for well over 10 hours on a sweltering summer hike (Yes it was tested in Scotland on one of those rare days where we had sunshine, and yes 18 c is sweltering!) and when the weather returned to normal a few days after it kept my piping hot coffee toasty warm throughout a cold day and again through a cold wet evening watching the flames of the fire pit. No more lukewarm disappointment!

EXPLINATION: Double-wall vacuum insulation uses two walls with a vacuum-sealed gap between them. This vacuum prevents heat transfer through conduction and convection, while a reflective inner wall minimizes radiation. As a result, the contents inside remain hot or cold for extended periods, without condensation on the outside.

Super Sparrow Flask Technology!

The leak-proof twist lid is another excellent feature for adventuring. As outdoors folk, we can not emphasise the importance of a reliable seal for on-the-go use, leaking coffee, soup etc over your dry clothes, batteries, phone, first aid kit etc is not an enjoyable experience, especially when you need them and haven’t individually packed them in a dry bag. The innovative RotateSip technology lets you pour without removing the stopper, which is a game-changer for one-handed hydration on the trail. And like most flasks when you remove the lid, it conveniently doubles as a cup, with a good capacity!

Super Sparrow Flask

Practical And Easy To Clean

As mentioned above, some stainless steel flasks can be thin, and therefore harder to clean, this however, is a wide boy and from a practical standpoint, the wide mouth makes it easy to add ice cubes, boiling liquids or brush out the interior for easy cleaning. Saying that you can simply toss the whole bottle in the dishwasher without worry when you get home.

With three size options from 500ml up to 1 litre, there’s a Super Sparrow to meet any hydration need. I’ve been loving the 750ml for day hikes, chilling in the garden at the fire pit, and when I want to travel lighter but still want enough water to last me through longer walks, as well as for long spells at the computer.

Conclusion Of My Stainless Steel Super Sparrow Water Bottle Review

In short, if you’re looking for a rugged, ultra-light, reusable, premium water bottle to keep you hydrated and energised on all your outdoor pursuits, to keep drinks cold or warm, then I can’t recommend the Super Sparrow enough. It’s an investment that will keep paying dividends with every mile you cover. Stay hydrated out there!

Super sparrow stainless steel vacuum flask Product Specs:

  • 18/8 medical-grade stainless steel construction
  • BPA free and chemical-free
  • Vacuum insulation for maximum temperature retention
  • Twist & Pour stopper with RotateSip technology
  • Leak-resistant lid that doubles as a cup
  • Wide mouth for easy filling/cleaning
  • 500ml, 750ml, and 1000ml size options
  • Dishwasher safe

Reasons to Buy:

  • Extremely durable and built to last a lifetime of adventures
  • Insulation keeps beverages hot or cold for over 24 hours
  • Leak-proof lid allows one-handed drinking on the go
  • Wide mouth and dishwasher safe for easy cleaning
  • Perfect for cold drinks and hot drinks
  • Multiple size and colour options for different hydration needs
  • Eco-friendly and BPA-free to avoid harmful chemicals
  • Stylish design meets functional performance

Don’t settle for a flimsy, poorly-insulated water bottle that will leave you disappointed on your next outdoor excursion. Upgrade to the premium, high-performance Super Sparrow Stainless Steel Thermos Flask. With its rugged construction, incredible insulation, and leak-proof portable design, it’s the last water bottle you’ll ever need to stay hydrated on all your adventures. Click the link below to invest in the Super Sparrow today and never go thirsty in the great outdoors again! One of the best vacuum flask out there!

Articles You May like

Gear Guides

Affiliate Disclaimer: is powered by affiliate revenue. Some links on our website may earn us commission, this does not affect what you pay. This helps us run this website.