Retention hours only compare when the stated conditions match · review
A 1 liter flask with a removable tea infuser and a named steel, whose retention claim is the words "several hours" and no number at all.
A 1 liter stainless flask in stated 18/08 steel with a double-walled construction, supplied with a removable screw-in tea infuser and backed by a stated 60-day money-back offer.
A filter insert that unscrews, stated to suit loose leaf, tea bags and whole leaves. It is the feature the listing leads on, and it is the only flask here to carry one.
Nothing measurable. The listing states the water temperature stays stable over several hours, hot or cold, and gives no figure for either. This page carries no hours on either line as a result.
That is a harder gap than it looks. Elsewhere in this hub the problem is hours quoted without conditions; here there are no hours to have conditions.
No mouth diameter, despite an insert screwing into it. No lid mechanism, behind the word leak-proof. No finish, no base diameter, no empty weight — on a liter flask, the last of those is the one you notice on a long day.
A liter of hot water is heavy before the flask is counted, and the flask is not weighed. If a packed weight matters to you, this listing will not help you work it out.
The American Amazon catalog lists it with no seller standing behind the entry.
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 | Double-walled insulation — stated; the listing does not use the word vacuum |
| Steel grade | 18/08 stainless steel — stated |
| Hot retention | Not published on the listing — the listing says the water temperature stays stable over several hours, hot or cold, with no figure |
| Cold retention | Not published on the listing — the same "several hours" phrase covers both directions, and no figure is given for either |
| Retention conditions stated | Not published on the listing — no retention figure is published, so there are no conditions behind one |
| Mouth diameter | Not published on the listing — a screw-in tea infuser fits the opening, and no diameter is given |
| Lid type | Not published on the listing — the flask is stated leak-proof and a removable filter insert screws in, and the closure itself is not described |
| Seal availability | Not published on the listing |
| Base diameter | Not published on the listing |
| Finish | Not published on the listing |
| Empty weight | Not published on the listing |
| Amazon reference | B08ZNNR8ZQ |
| EAN | 4270002350199 |
The listing does not say. It states the water temperature stays stable over several hours and it does not separate hot from cold, so this page carries no figure on either line. Six of the nine flasks here quote hours; this is not one of them.
The maker states it suits loose leaf tea, tea bags and whole leaves, and that it unscrews. What is not stated is the diameter of the opening it screws into, which is what decides whether a bottle brush reaches past it to clean the flask.
No. Not published on the listing — the listing says the water temperature stays stable over several hours, hot or cold, with no figure. What the listing does publish instead is the wall construction: Double-walled insulation — stated; the listing does not use the word vacuum.
7.8/ 10
The tea flask of the hub, and the one that says least about insulation. A liter, a named steel, an infuser — and "several hours" where the number should be.
A liter of tea brewed in the flask, where the infuser matters more than a published number of hours.
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
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.
