Retention hours only compare when the stated conditions match · review
A 500 ml vacuum flask that names 18/8 steel and both retention figures, ships with a cotton sleeve, and calls itself lightweight without publishing a weight.
The bottom line A straightforward 500 ml vacuum flask with its steel named and its hours quoted. It calls itself light and will not say how light, which is this hub in one line.
A 500 ml double-wall vacuum flask in stated 18/8 food-grade stainless steel, with a screw cap, a cotton protective sleeve in the box, and a choice of thirteen colours.
12 hours hot for coffee, 24 hours cold for water. Tying each figure to a drink is a small piece of extra information, and it stops there: no starting temperature, no ambient temperature, no fill level. Treat the pair as the same claim the rest of this hub makes.
The listing states the double wall minimises condensation, which is a claim about the outside of the flask rather than about the drink. On a cold fill in a pack, that is the difference between a dry pack and a damp one, and it is the sort of claim only a vacuum construction supports.
No weight, on a flask described as lightweight. No mouth diameter, on a flask described as easy to clean. No base diameter, on a flask stated to fit many cup holders. No coating named, behind thirteen colours.
The sleeve changes the diameter the flask presents to a cup holder or a bottle pocket. Neither figure is published, so measure the pocket you intend to use.
Selling between 10 € and 15 € across the German, French, Italian and Spanish Amazon stores when this page was checked.
It also sells on the British Amazon store in the local currency, which the range above does not cover — that range counts euro stores and nothing else.
Catalogued on the American Amazon store 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-wall vacuum insulation — stated, and stated to reduce condensation on the outside |
| Steel grade | 18/8 stainless steel — stated, described as food grade |
| Hot retention | 12 hours — stated, quoted for coffee |
| Cold retention | 24 hours — stated, quoted for water |
| 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 | Screw cap — stated, described as helping to prevent leaks |
| Seal availability | Not published on the listing |
| Base diameter | Not published on the listing — the flask is stated to suit many cup holders, with no figure |
| Finish | Not published on the listing — thirteen colours are offered and a cotton sleeve is supplied; the coating itself is not named |
| Empty weight | Not published on the listing — the flask is described as lightweight, with no figure |
| Amazon reference | B07KFPCGFC (same reference on 6 Amazon marketplaces) |
| EAN | 7437337288291 |
The listing does not say. It uses the word twice and gives no figure, and no flask in this hub publishes an empty weight either. On a 500 ml stainless flask the difference between listings is real and none of them will tell you what it is.
The maker does not address it. The sleeve is presented for grip and carrying, and the 12 and 24 hour figures are quoted without any conditions at all, so nothing on the page says whether they were arrived at with the sleeve on or off.
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 €
