Retention hours only compare when the stated conditions match · review
The only flask here that publishes a layer count for its insulation — five — alongside both retention figures, and that never describes the closure holding it all in.
A 1 liter stainless flask with a stated five-layer vacuum insulation, quoted at 12 hours hot and 24 hours cold in the title, stated to be fully leak-proof and safe with carbonated drinks, with a scratch-resistant surface.
No other listing in this hub says how its insulation is built. This one says five layers. That is worth something, and it is worth remembering what it is not: the layers are counted, never dimensioned, and the retention figures beside them come with no conditions, so nothing here can be measured against a rival.
The listing claims leak-proof twice, including under carbonation, and never says what does the sealing. A screw stopper, a flip lid and a push-button lid fail differently and are cleaned differently. This page cannot tell you which one is fitted.
No steel grade. No mouth diameter. No base diameter. No empty weight. No spare seal.
If the closure matters to you — and on a carbonated fill it is the whole thing — this is the listing in the hub with the least to say about it.
The American Amazon store returned nothing, so the buy link opens a local search rather than a page that is not there.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
A listing is not an offer: the reference exists on these stores, availability changes daily.
| Capacity | 1 liter — stated in the title |
|---|---|
| Wall construction | Five-layer vacuum insulation — stated; no other listing in this hub publishes a layer count |
| Steel grade | Not published on the listing — stainless steel is named throughout, with no grade |
| Hot retention | 12 hours — stated |
| Cold retention | 24 hours — stated |
| Retention conditions stated | Not published on the listing — no starting temperature, ambient temperature or fill level is given behind either figure |
| Mouth diameter | Not published on the listing |
| Lid type | Not published on the listing — the flask is stated 100% leak-proof and safe with carbonated drinks, and the closure itself is never described |
| Seal availability | Not published on the listing |
| Base diameter | Not published on the listing |
| Finish | Not published on the listing — a scratch-resistant surface is claimed, with no coating named |
| Empty weight | Not published on the listing |
| Amazon reference | B08PKYZ91M |
| EAN | 4260686560045 |
The listing states five layers and does not break them down or give a thickness. It is more detail than the rest of this hub offers, and it is still a claim rather than a measurement, because the 12 and 24 hour figures beside it carry no conditions.
The listing does not say. It states the flask is 100% leak-proof, including with carbonated drinks, without naming a screw stopper, a flip lid or anything else. That is unusual on a flask whose whole argument is that it seals.
No. Not published on the listing — stainless steel is named throughout, with no grade. What the listing does publish instead is the wall construction: Five-layer vacuum insulation — stated; no other listing in this hub publishes a layer count.
7.8/ 10
A liter that quantifies its insulation and refuses to name its lid. The one claim that matters most is the one with nothing behind it.
A liter where the construction claim is what is being bought, and the closure is being taken on trust.
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
Prices in these summaries were read on the dates each review gives. The live figure sits beside every product.
