Retention hours only compare when the stated conditions match · review
Eighteen hours hot is the longest retention claim on this shelf, on the one listing here that combines a twist-and-pour stopper, a built-in serving cup and a dishwasher.
A 16 oz Stainless King vacuum bottle, matte steel.
Thermos states its vacuum insulation technology keeping beverages hot for 18 hours or cold for 24; high-quality 18/8 stainless steel construction with a built-in serving cup; an exterior that stays cool to the touch with hot drinks and sweat-proof with cold, and bottles that are dishwasher safe with the top rack recommended; a twist-and-pour stopper allowing pouring without removing the stopper completely; and the same bottle in 40 oz and 68 oz.
No conditions. No mouth figure. No base figure. No seal availability. No weight.
Six more than everything else.
Several of the twelve listings here claim 12 hours hot or less. One European listing claims 13 hours of stability without separating hot from cold.
A 16 oz bottle also has the worse surface-to-volume ratio, which makes the claim harder to meet rather than easier.
What is absent — here and on all fifteen — are the conditions. The introduction above says they matter more than the hours.
The only one in this group.
A quarter turn opens a pouring channel and the stopper stays in the neck, so soup or coffee goes into the cup one-handed at a cold stop.
The built-in stainless cup is the other half of that design.
The cost is the gasket inside the mechanism, which has to come out and dry, and which no listing on this shelf offers a replacement for.
One of three cleaning statements on this shelf.
Top rack recommended, away from the element.
The other two are in this group: EcoVessel says its flask and cup are both dishwasher safe, and Iron Flask says HAND WASH ONLY in capitals. The nine European listings say nothing.
The matte bare steel finish is part of why the dishwasher is allowed here — and the reason the bottle will show its knocks.
The American Amazon store was listing it at about $26 at the time of writing.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Capacity | 16 oz — stated, about 470 ml, described as compact. The maker states that the Stainless King also comes in 40 oz and 68 oz. It is the second-smallest capacity in this group |
|---|---|
| Wall construction | Vacuum insulation — stated as the maker’s own technology, with the exterior stated to stay cool to the touch with hot drinks and sweat-free with cold. No layer count beyond the vacuum |
| Steel grade | 18/8 stainless steel — stated as high quality, for the body and for the built-in cup |
| Hot retention | 18 hours — stated twice, in the bullets and in the description. It is the longest hot retention published on this shelf: the other fourteen listings claim 12 hours or less, and one European listing claims 13 hours of stability without separating hot from cold |
| Cold retention | 24 hours — stated. The standard claim across this shelf, so the hot figure is where this bottle separates itself |
| Retention conditions stated | Not published — no starting temperature, no ambient temperature and no threshold that still counts as hot. No listing on this shelf publishes them, which this shelf's introduction says matters more than the hours do |
| Mouth diameter | Not published as a figure, and the mouth is not described as wide or narrow either. What is published instead is the stopper behavior: it pours without being removed completely |
| Lid type | A twist-and-pour stopper, stated to allow pouring without removing the stopper completely, with a built-in stainless serving cup over it. That is the classic flask arrangement, and the only one in this group with a stopper rather than a drinking lid |
| Seal availability | Not published. No listing on this shelf addresses replacement seals, and a twist-and-pour stopper is the kind of part this shelf's introduction warns about — a mechanism that hides a gasket |
| Base diameter | Not published, and no cup-holder statement is made. At 16 oz and described as compact it is the likeliest bottle in this group to stand in one, and the listing does not confirm it |
| Finish | Matte steel — stated. Not a powder coat, so the surface is the steel itself: this shelf's introduction notes that bare steel shows every knock where a coat resists chipping |
| Empty weight | Not published |
| Amazon reference | B01DZQT0CE |
| EAN | 0041205701163 |
It is the longest hot claim on this shelf by six hours, and the thing that would let you test it is missing — as it is on several of the twelve listings here. This shelf's introduction is specific: every retention figure comes from conditions the maker sets, a starting temperature, an ambient temperature and a threshold that still counts as hot, and two flasks quoting the same duration have not necessarily been measured the same way. What can be said is that this figure is published twice on the page, that it comes from the brand that invented the category, and that a 16 oz bottle has a better surface-to-volume ratio working against it than a 40 oz one, which makes the claim harder rather than easier.
It lets you pour one-handed without taking the stopper off and finding somewhere to put it — a quarter turn opens a channel, and the stopper stays in the neck. For soup or coffee poured into a cup at a cold stop, that is the right mechanism, and it is the only stopper of its kind in this group, where everything else has a straw lid or a drinking spout. The cost is the one this shelf's introduction names: a mechanism hides a gasket that has to come out and dry, and no listing on this shelf says whether replacement seals can be bought.
Yes — the listing states that Thermos beverage bottles are dishwasher safe, with the top rack recommended. That is one of only three cleaning statements on this entire shelf, and all three are in this group: this one and EcoVessel say yes, Iron Flask says hand wash only in capitals, and the nine European listings say nothing. The top-rack qualifier matters because it keeps the bottle away from the heating element. Note also that the finish here is matte bare steel rather than a powder coat, which is part of why the dishwasher is permitted.
Close prices, same category: comparable camping gear. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Capacity | Wall construction | Steel grade | Hot retention |
|---|---|---|---|---|---|
| Thermos Stainless King SK2000 | $26 | 16 oz — stated, about 470 ml, described as compact. The maker states that the Stainless King also comes in 40 oz and 68 oz. It is the second-smallest capacity in this group | Vacuum insulation — stated as the maker’s own technology, with the exterior stated to stay cool to the touch with hot drinks and sweat-free with cold. No layer count beyond the vacuum | 18/8 stainless steel — stated as high quality, for the body and for the built-in cup | 18 hours — stated twice, in the bullets and in the description. It is the longest hot retention published on this shelf: the other fourteen listings claim 12 hours or less, and one European listing claims 13 hours of stability without separating hot from cold |
| magcheer 1-liter wide-mouth vacuum flask | $22 | 1 liter — stated in the title | Double-wall vacuum insulation — stated | 18/8 stainless steel — stated, described as food grade and non-toxic | 12 hours — stated |
| honogo 32 oz, two lids | $20 | 32 oz — stated, about 950 ml, and stated in both the title and the bullets | Double-layered vacuum insulation — stated, with the bottle described as 100 per cent sweat free and free of condensation | 18/8 of 304 stainless steel — stated, with non-toxic, BPA-free and phthalate-free claims. It is the only listing in this group to give the AISI number behind 18/8; on the European side one listing distinguishes SUS 201 outside from SUS 304 inside | Up to 12 hours — stated, with fresh taste claimed. The common figure on this shelf |
| Blockhütte 1-liter vacuum flask with brush | $33 | 1 liter — stated in the title | Not published on the listing — the flask is called insulated throughout, and neither a double wall nor a vacuum is named | 18/08 stainless steel — stated, and stated to suit carbonated drinks | Not published on the listing — 13 hours is published for holding the water temperature stable, without saying whether that is hot, cold or both |
Coffee or soup carried overnight and poured into a cup, where hot hours are the whole point
Amazon reports what buyers took in the month before this page was last checked: at least 900.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for camping and hiking gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
1 liter · 18/08 stainless · 13 h temperature stability stated, hot and cold not separated · bottle brush, jute bag and carabiner supplied
A 1 liter flask supplied with a natural-bristle brush and a carabiner, whose single retention figure of 13 hours is never split into hot and cold.
Best for: A liter bottle bought with its brush and its carry loop, where cleaning matters more than a comparable hours figure.
≈ $33
500 ml · vacuum insulated · SUS 201 outside and SUS 304 inside · 24 h cold and 12 h hot stated · brushed finish · top handle
The only flask here that names a different steel for the inside and the outside, alongside a stated vacuum, both retention figures and a brushed finish.
Best for: A day out where a named inner steel, a stated vacuum and a dishwasher-safe body matter more than the hours quoted.
8 oz · TriMax triple insulation, the only triple-wall claim here · food-grade stainless, grade not named · 24 h stated once, hot and cold not separated · removable 3 oz silicone cup · folding hidden handle · dishwasher safe, flask and cup
The only triple-wall claim on this shelf, on an eight-ounce flask with a removable three-ounce silicone cup in its base — and a single 24-hour figure that does not separate hot from cold.
Best for: A hip-pocket flask for spirits or a single coffee, where two can share from one cup
≈ $10
