Retention hours only compare when the stated conditions match · review
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.
The bottom line The listing that behaves best on materials in this hub — a vacuum, two named steels, a named gasket — and that still leaves the mouth, the base and the weight blank.
A 500 ml brushed stainless flask with a stated vacuum between a SUS 201 outer shell and a SUS 304 inner shell, a removable screw lid with a full-jacket gasket, and a carry handle on the top.
Most listings here say stainless steel and stop. This one names SUS 201 outside and SUS 304 inside, and it states a vacuum rather than only a double wall. It also states the flask is safe with carbonated drinks, which is a claim about the seal as much as the shell.
24 hours cold, 12 hours hot — the same pair as four other flasks here. The starting temperature, the ambient temperature and the fill level are absent, exactly as they are everywhere else in the hub. Two flasks quoting the same hours have not necessarily been measured the same way, and here none of them says how.
No mouth diameter. The flask is stated dishwasher safe, which reduces the problem, but a brush still has to fit for anything the machine misses.
No base diameter, despite the listing stating it suits a car holder. No empty weight. No replacement gasket offered.
The full-jacket gasket is the wear part. Nothing on the page says one can be bought, so plan on the flask outliving it.
Selling at about 13 € on the German Amazon store when this page was checked.
Catalogued on the American, British, French, Italian and Spanish Amazon stores with nobody selling it: the reference is there, the offer is not.
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 | 500 ml — stated |
|---|---|
| Wall construction | Double stainless shell with vacuum insulation — stated; also stated to be safe with carbonated drinks |
| Steel grade | SUS 201 outer shell and SUS 304 inner shell — both stated |
| 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 | Removable screw lid with a full-jacket gasket, stated 100% leak-proof; a carry handle sits on the top |
| Seal availability | Not published on the listing — the gasket is named as a full-jacket seal, and no replacement is offered |
| Base diameter | Not published on the listing — the flask is stated to suit a car holder, with no figure |
| Finish | Brushed stainless steel — stated |
| Empty weight | Not published on the listing |
| Amazon reference | B0DTPXHFV4 (same reference on 6 Amazon marketplaces) |
| EAN | 4062861852903 |
It is a statement about the two surfaces separately, which is unusual on this shelf. The inner shell is the one your drink touches; the outer shell is the one that gets knocked. Naming both is more information than any other listing here gives, and this page reports it without judging the choice.
The maker states it is, and repeats it twice. What the listing does not state is whether the gasket should be removed first, which on a full-jacket seal is the part that traps water.
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 €
1 litre · five-layer vacuum insulation stated · 12 h hot and 24 h cold stated · leak-proof with carbonated drinks · scratch-resistant surface
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.
Best for: A litre where the construction claim is what is being bought, and the closure is being taken on trust.
≈ 28 €
