Head-to-head · Best Insulated Water Bottles

Klean Kanteen TKWide Insulated 32 oz vs ThermoFlask Double Wall Vacuum Insulated 32 oz

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

ThermoFlask Double Wall Vacuum Insulated 32 oz comes out ahead by a clear margin (4.3 vs 4.8). The gap is mostly about budget-conscious users prioritizing convenience — read the strengths below before deciding.

Ranked #6 in Best Insulated Water Bottles

Klean Kanteen TKWide Insulated 32 oz

4.3

3 sourcesall derived$46.95as of Jun 29

The Klean Kanteen TKWide 32 oz is built tough and insulates hard, keeping drinks cold for up to 75 hours. Reviewers praised the leak-proof Twist Cap with its integrated steel straw and how well it resists scratches and dents. It's made from 90% post-consumer recycled stainless steel and carries a lifetime guarantee. It isn't recommended for very hot liquids, and the opening is narrow enough that some ice cubes won't fit. Outdoor users who want a reliable, eco-friendly bottle should look here.

Strengths

— Made from certified 90% post-consumer recycled 18/8 stainless steel
— Keeps contents iced up to 75 hours according to manufacturer
— Leak-proof Twist Cap with built-in reusable steel straw that stays secure

Watch-outs

— Not recommended for very hot liquids due to steel straw
— Has a narrow opening that may not fit all ice cubes

$46.95 · Check Price on Amazon Full review →

Higher ratedRanked #1 in Best Insulated Water Bottles

ThermoFlask Double Wall Vacuum Insulated 32 oz

4.8

2 sourcesall derived$28.99as of Jul 31

The ThermoFlask 32 oz insulated tumbler holds temperature reliably, with double-wall vacuum insulation keeping beverages cold for up to 24 hours. Costco reviewers point to its durability, the fact that it's dishwasher safe, and that it fits a cup holder. It's built from 18/8 food grade stainless steel with a wide mouth lid that's easy to clean and fill. Reviewers rate the performance and convenience but note it's made in China and includes only standard Tritan straws, with no alternative materials.

Strengths

— Double-wall vacuum insulation keeps drinks ice cold for up to 24 hours
— BPA-free 18/8 food grade stainless steel construction
— Dishwasher safe for easy cleaning

Watch-outs

— Made in China according to product details
— Includes only standard reusable Tritan straws, not silicone or metal options

$28.99 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Klean Kanteen TKWide Insulated 32 oz

The Klean Kanteen TKWide 32 oz excels in eco-friendliness with its 90% post-consumer recycled steel, a feature not found in the Hydro Flask or Iron Flask. It offers superior cold retention compared to the ThermoFlask and Simple Modern, though it's less durable than the YETI Rambler and has a narrow opening that may not accommodate all ice cubes. Unlike the Owala FreeSip, it lacks the dual-drinking functionality, making it better suited for those prioritizing sustainability over convenience.

ThermoFlask Double Wall Vacuum Insulated 32 oz

The ThermoFlask offers excellent dishwasher safety and cup holder compatibility, features not found in the Iron Flask or Simple Modern. It provides good insulation comparable to the Klean Kanteen and Simple Modern, but lacks the eco-friendly recycled materials of the Klean Kanteen and the versatile lid options of the Hydro Flask. Unlike the YETI Rambler, it's more affordable but less durable, and it doesn't offer the dual-drinking functionality of the Owala FreeSip.

Specs side-by-side

Spec	Klean Kanteen TKWide Insulated 32 oz	ThermoFlask Double Wall Vacuum Insulated 32 oz
Capacity	32 oz (946 ml)	32 oz.
Material	90% post-consumer recycled 18/8 stainless steel	18/8 food grade stainless steel
Insulation	75 hours cold retention	Double wall vacuum
Lid Type	Twist Cap with steel straw	screw on wide mouth lid
Weight	1.14 lb	—
Cold Retention	up to 75 hours	up to 24 hours
Brand	Klean Kanteen	ThermoFlask

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