Retention hours only compare when the stated conditions match · review
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.
The bottom line The flask that ships with the brush and the carabiner, and the one whose insulation claim is the thinnest here: one number, no direction, no construction named.
A 1 litre stainless bottle in stated 18/08 steel, supplied with a natural-bristle cleaning brush, a jute bag and a trekking carabiner, stated leak-proof and stated to suit carbonated drinks.
The listing states the water temperature is held stable over 13 hours. It does not say hot. It does not say cold. It does not say both.
Six flasks in this hub quote a pair — typically 12 hours hot and 24 cold. One figure that refuses to name its direction cannot be placed against either half of that pair, so this page reports it as published and leaves both lines unfilled.
Nothing in the title or the bullets says double wall, and nothing says vacuum. The word used is insulated. On this shelf that is the one claim everybody makes and almost everybody qualifies.
A natural-bristle brush — the only one supplied anywhere in this hub — a jute bag and a carabiner. The maker also commits to sending a replacement or finding another solution if the bottle leaks, and states a 60-day money-back offer.
The brush comes with it and the opening it fits through is not dimensioned. If you want to use a brush you already own, nothing on the page will tell you whether it goes in.
Selling between 29 € and 33 € across the German, French, Italian and Spanish Amazon stores when this page was checked.
It also sells on the American and British Amazon stores in the local currency, which the range above does not cover — that range counts euro stores and nothing else.
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 | Not published on the listing — the flask is called insulated throughout, and neither a double wall nor a vacuum is named |
| Steel grade | 18/08 stainless steel — stated, and stated to suit carbonated drinks |
| Hot retention | Not published on the listing — 13 hours is published for holding the water temperature stable, without saying whether that is hot, cold or both |
| Cold retention | Not published on the listing — the same single 13 hour figure covers the whole claim, and the listing never separates the two directions |
| Retention conditions stated | Not published on the listing — no starting temperature, ambient temperature or fill level is given behind the 13 hour figure |
| Mouth diameter | Not published on the listing — a bottle brush is supplied, and the opening it goes through is not dimensioned |
| Lid type | Not published on the listing — the flask is stated leak-proof and the closure is never described |
| Seal availability | Not published on the listing — the maker offers a replacement bottle or another solution if the flask leaks, which is a guarantee rather than a spare part |
| Base diameter | Not published on the listing |
| Finish | Not published on the listing |
| Empty weight | Not published on the listing |
| Amazon reference | B08KGPL2GR (same reference on 6 Amazon marketplaces) |
| EAN | 4270001302649 |
The listing does not say. It states the water temperature is held stable for 13 hours and never separates the two. Every other flask here that quotes hours quotes two figures; this one quotes one and leaves its direction open, so this page carries it on neither line as a measurement.
Not that the listing offers. What it does offer is a replacement bottle or another solution if you have leakage problems, plus a 60-day money-back offer. That is a guarantee on the product, not a spare part, and the difference matters on a flask you expect to outlive its first gasket.
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 €
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 €
