Flasks · one liter
Five layers, or a named steel and a described lid? Two one-liter flasks, same stated hours.
A liter each, 12 hours hot and 24 cold each, vacuum insulation on both: the headline is the same twice over. What separates them is on the edges. Limes 8 is the only flask in this hub to publish a layer count for its insulation, five, and never describes its closure; magcheer names its steel and its screw lid and stops at double-wall. Neither publishes a mouth diameter, a base diameter or an empty weight.
| Compared on | 1-liter five-layer vacuum flask | 1-liter wide-mouth vacuum flask |
|---|---|---|
| Capacity | 1 liter — stated in the title | 1 liter — stated in the title |
| Wall construction | Five-layer vacuum insulation — stated; no other listing in this hub publishes a layer count | Double-wall vacuum insulation — stated |
| Steel grade | Not published — stainless steel is named throughout, with no grade | 18/8 stainless steel — stated, described as food grade and non-toxic |
| Hot retention | 12 hours — stated | 12 hours — stated |
| Cold retention | 24 hours — stated | 24 hours — stated |
| Retention conditions stated | Not published — no starting temperature, ambient temperature or fill level is given behind either figure | Not published — no starting temperature, ambient temperature or fill level is given behind either figure |
| Mouth diameter | Not published | Not published — the mouth is stated wide enough to take ice cubes and a brush, with no figure |
| Lid type | Not published — the flask is stated 100% leak-proof and the closure itself is never described | Screw lid with a vacuum seal — stated; all parts stated dishwasher safe |
| Empty weight | Not published | Not published |
| Listed on amazon.com | No | Yes |
Each tick belongs to its own line and nothing more. The row of ticks is not a score: the two verdicts underneath settle the page, because these two answer different questions on the trail.
No amazon.com listing was found for this one. We hold references for other markets but none for the United States, so it may not be buyable here — which is the first thing to weigh against anything below.
The Limes 8 publishes the one construction detail nobody else on this shelf publishes — five layers of vacuum insulation — and it is stated leak-proof with carbonated drinks. It names no steel grade and never describes the closure that leak-proof claim depends on, so the detail it does publish stands alone.
The magcheer is the more completely described of the two: 18/8 steel, a screw lid with a vacuum seal, a wide mouth stated to take ice and a brush, a carry handle and a non-slip silicone base. It publishes no layer count and no dimension anywhere, so nothing here says how big the wide mouth is.
The two listings are not describing the same thing in the same units. A layer count is not a wall construction and neither maker says what the layers are, so the line goes to the one that published a figure at all. Both quote the same 12 and 24 hours behind their respective descriptions.
Because every flask in this hub does. A retention figure with no starting temperature, ambient temperature or fill level behind it cannot be compared with another one, which is why this site prints the hours as the maker states them and prints the missing conditions on the line below.
1 liter · 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 liter where the construction claim is what is being bought, and the closure is being taken on trust.
1 liter · double-wall vacuum · 18/8 stainless · 24 h cold and 12 h hot stated · wide mouth stated to take ice · screw lid with vacuum seal
A 1 liter vacuum flask with a wide mouth stated to take ice, a screw lid with a vacuum seal, a carry handle and a non-slip silicone base — and no dimension behind any of it.
Best for: A liter of iced drink where a wide mouth and a dishwasher-safe lid matter more than packing small.
≈ $22
Prices in these summaries were read on the dates each review gives. The live figure sits beside every product.
