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.
The bottom line A litre that quantifies its insulation and refuses to name its lid. The one claim that matters most is the one with nothing behind it.
A 1 litre 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.
Selling between 28 € and 36 € across the German, French and Italian Amazon stores when this page was checked.
Catalogued on the Spanish Amazon store with nobody selling it: the reference is there, the offer is not.
Nothing came back from the American and British Amazon stores, so the buy link there opens a local search instead of a page that is not there.
Every figure in this section is what Keepa returned on the day this page was last updated. Prices and offers change without notice.
Prices quoted in this text were read on 6 September 2026. The live price is at the top of the page.
| Capacity | 1 litre — 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 (same reference on 4 Amazon marketplaces) |
| 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.
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.
≈ 13 €
1 litre · 18/08 stainless · 13 h temperature stability stated, hot and cold not separated · bottle brush, jute bag and carabiner supplied
A 1 litre 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 litre bottle bought with its brush and its carry loop, where cleaning matters more than a comparable hours figure.
≈ $33 / £24 / 29 €
18/8 stainless · double wall · 24 h cold and 12 h hot stated · three lids supplied · powder coat · capacity not published
The flask with three lids in the box and both retention figures on the page — and no capacity anywhere in the listing, which is an unusual thing to leave out.
Best for: A walker who wants a straw lid on the trail and a plain lid at work, from one flask.
≈ £10 / 11 €
