Esbit Boîte isotherme 1L
(32 reviews)
A generous one-liter capacity and an all-stainless build: this Esbit insulated food jar is built first and foremost for hiking and heavy outdoor use.
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Key features
- Capacity: 1 liter
- Material: Food-grade 18/8 stainless steel, double wall, stainless outer shell
- Opening: 79 mm, wide diameter for easy filling and cleaning
- Lid doubles as a bowl, extremely rugged all-stainless shell
In detail: Esbit Boîte isotherme 1L
The Esbit one-liter insulated food jar stands out for its all-18/8-stainless-steel construction, including the outer shell, unlike many competing insulated jars that pair a stainless inner wall with a plastic outer shell. This material choice, more costly to produce, delivers superior toughness against the knocks and abrasion typical of heavy outdoor use, whether hiking or camping overnight.
With a one-liter capacity and a wide 79 mm opening, this insulated meal jar offers enough room for a full meal rather than a simple snack, while making filling and cleaning easier. The lid, fitted with a pressure-release push button, opens easily even after several hours of travel, and can itself double as a bowl or plate once the meal is ready to serve.
Thermally, the vacuum double wall keeps food above 60°C for about 6 hours, and above 40°C for 12 hours, a valuable performance for hikers who have no heat source along their route and rely on their container's thermal retention to enjoy a hot meal hours after it was prepared.
German brand Esbit, recognized for more than 85 years in hiking and lightweight camping gear, notably for its solid-fuel stoves, applies the same standards to the design of its insulated accessories. At about 580 g, this jar remains heavier than most plastic-and-stainless insulated lunch boxes, a trade-off deliberately made in favor of ruggedness and durability.
For hikers and outdoor enthusiasts who prioritize long-term sturdiness and thermal performance over lightness at all costs, this Esbit insulated jar is a choice that matches the demands of the trail, built to last many seasons.
Technical data
Detailed characteristics
Performance
| Heat retention?How long the container keeps its contents hot. | Above 60°C for 6 hours, above 40°C for 12 hours |
|---|
Dimensions and material
| Capacity?Usable volume of the container, in litres. | 1 liter |
|---|---|
| Material?Main material used to make the container. | Food-grade 18/8 stainless steel, double wall, stainless outer shell |
| Opening?Diameter or width of the container's opening. | 79 mm, wide diameter for easy filling and cleaning |
| Closure?System used to seal the container tightly. | Pressure-release push button, 100% leak-proof |
| Weight?The container's empty weight. | About 580 g |
Comparison
In the insulated food jar segment, the Esbit Classic 1L is often compared to the Thermos King Food Flask 470ml, a long-standing reference in insulated food containers. Here is how the two compare, based on both brands' manufacturer data.
| Criterion | Esbit Classic 1L | Thermos King Food Flask 470ml |
|---|---|---|
| Capacity | 1 liter | 470 ml |
| Material | Food-grade 18/8 stainless steel, stainless outer shell | Stainless steel, stainless shell |
| Heat retention | Above 60°C for 6 hours | About 7 hours |
| Opening | 79 mm, lid doubles as a bowl | Wide opening, lid doubles as a bowl, folding spoon included |
| Weight | About 580 g | About 450 g |
| Price observed | ≈ €42 | ≈ €35 to 40 |
In summary, the Esbit Classic banks on a much larger capacity and an all-stainless shell that is particularly rugged against knocks, while the Thermos King stays more compact and comes with a folding spoon that is handy on the move. For a genuine full meal on a hike rather than a small portion, the Esbit keeps the edge on volume.
Our tester's verdict: Yoni Marchal-Laporte
Used across several hiking trips and overnight camps, the Esbit jar first impresses with its ruggedness: the all-stainless shell absorbs knocks in a backpack without denting, unlike competing plastic-shelled boxes that end up cracked after a single season. Temperature retention delivers too: a meal prepared hot in the morning is still very much edible at lunchtime, staying around 60°C for several hours. The wide opening makes it easy to load with chunkier pieces than a simple soup, and the bowl-lid is a smart way to eat without extra dishes. The main drawback remains the weight, about 580 g empty, which adds up in a pack already loaded for several days of walking, along with the price, higher than plastic-shelled insulated jars. But for anyone after a jar that can last many seasons without worrying about knocks, backed by Esbit's solid reputation in outdoor gear built over more than 85 years, this choice is fully justified.
Frequently asked questions: Esbit Boîte isotherme 1L
Food stays above 60°C for about 6 hours, and above 40°C for 12 hours, thanks to its vacuum-insulated stainless steel double wall. A hot meal prepared in the morning therefore stays pleasant to eat right through to lunch.
Yes, its wide 79 mm opening makes it easy to reach the contents with a spoon, and the lid itself can serve as a bowl or plate once set down, handy for hiking or an improvised picnic.
Yes, the vacuum double wall works both ways and holds cold as well as heat, which lets you carry a fresh salad or fruit in summer without it warming up.
The wide opening makes hand-washing easy. It is best to avoid the dishwasher to preserve the lid's seal over time, as with most push-button insulated containers.
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Page published on 1 July 2026, updated on 31 July 2026