Insulation thickness and lid discipline, not the liter figure · review
The largest capacity on this shelf at 39 liters, and the only listing anywhere here to publish a thermal conductivity figure — on a box whose maker says in its own last sentence that the lid leaves gaps.
A collapsible 39 liter EPP ice chest, hard-sided.
BRILLIRARE states EPP foam with a thermal conductivity coefficient of 0.028, attributed to small bubbles in its structure; an advanced buckle design creating, in the maker’s words, an air tight vacuum seal, keeping drinks cold for up to 24 hours and hot for up to 12, with a waterproof surface layer that is easy to clean and shock-proof; a collapsible body saving up to 80 per cent of its space when folded, with two side handles; and a capacity of 39 L or 10.3 gallons, holding 60 small water bottles or jars.
Then, in the last sentence of the fifth bullet: add ice cubes with packaging bags, because there will be tiny gaps in the junction due to the buckle design.
No thickness. No conditions. No drain. No empty weight.
And calls it an air tight vacuum seal three bullets earlier.
This shelf’s introduction names the seal as the third thing that decides a cooler, and asks whether it is the part that fails first.
This page answers the question itself, in a parenthesis, with an instruction: bag the ice.
That is more than any other listing on this shelf admits, and it is also a contradiction sitting on one page.
Half of a sum.
Nought point nought two eight is the only conductivity figure published anywhere on this shelf. It says how readily heat crosses the material.
It cannot say how cold the box stays, because that needs the wall thickness, and the wall thickness is not here.
The Pinnacle box in this group publishes the other half: 20 mm (0.79 in) of polyurethane, and no conductivity.
Against 33 and a cluster at 30.
Ten point three US gallons, sixty small bottles, and 80 per cent of the space recovered when it folds.
What this shelf’s introduction asks for and this page does not give is the internal depth, against the tallest bottle you carry.
About $40 on Amazon.com at the October 24, 2026 check.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 24, 2026. The live price is at the top of the page.
| Box type | A collapsible rigid box — EPP foam walls that fold, stated to save up to 80 per cent of their space when packed down. It is the only folding rigid box on this shelf; the other rigid boxes here are fixed shells and the folding products are soft bags |
|---|---|
| Capacity | 39 L — stated, given also as 10.3 US gallons and as 60 small bottles or jars. It is the largest capacity published on this shelf, above the 33 L soft bag and the 30 L group |
| Insulation type | EPP foam — expanded polypropylene, named, and described as owing its insulation to small bubbles in its structure, with a waterproof surface layer over it |
| Insulation thickness | Not published. In its place the listing gives a thermal conductivity coefficient of 0.028, which is the only conductivity figure published anywhere on this shelf. A conductivity tells you how well the material insulates; a thickness tells you how much of it there is, and without the second the first cannot be turned into a wall |
| Ice retention | Up to 24 hours cold and up to 12 hours hot — stated. Against 48 hours claimed by two other American listings here and 40 hours by the European Brisby box |
| Ice retention conditions | Not published — no fill ratio, no ambient temperature, no ice quantity. No listing on this shelf publishes them, which is what this shelf's buying tip exists to warn about |
| Closure and seal type | A buckle lid, described in the second bullet as creating an air tight vacuum seal — and in the last sentence of the fifth bullet as leaving tiny gaps in the junction, with the instruction to add ice cubes in bags because of it. Both sentences are on the same page |
| Drain | Not published. No listing on this shelf publishes one, on a shelf where this shelf's introduction asks for a drain you can reach |
| Carry arrangement | Two side handles — stated. No shoulder strap and no wheels |
| Empty weight | Not published. Only two listings on this shelf publish one: the 1.3 kg (2.9 lb) European Kreher box and the 1.65 lb American Baglher backpack |
| Amazon reference | B0B6J7GQXH |
| EAN | 0771077235304 |
The listing answers this twice, and the two answers do not agree. Its second bullet describes an advanced buckle design creating an air tight vacuum seal. Its fifth bullet ends with a parenthesis asking you to add ice cubes in packaging bags, because there will be tiny gaps in the junction due to the buckle design. The second sentence is the useful one, and it is unusually honest — this shelf's introduction names the seal as the third thing that decides a cooler and asks whether it is the part that fails first. Here the maker has told you. Bag the ice, and expect melt water to find the junction.
On its own, not much, and this is the only listing on this shelf that publishes one. A thermal conductivity coefficient measures how readily heat passes through a material — lower is better, and 0.028 is a figure consistent with a good rigid foam. What it cannot tell you is how cold the box stays, because that depends on how thick the wall is, and the thickness is not published. Compare the Pinnacle box in this group, which publishes 20 mm (0.79 in) of polyurethane and no conductivity: between the two listings you have each half of the same sum, and neither has both.
It is the largest figure on this shelf, above the 33 L soft bag and the cluster at 30 L, and the listing backs it with 10.3 US gallons and 60 small bottles. What this shelf's introduction warns is that a liter of stated volume is not a liter of bottles, and the figure that would settle it — the internal depth, against the tallest thing you carry — is not published here. Nor is the folded dimension; what is published is that folding saves up to 80 per cent of the space. For a car boot that is the right trade; for standing 1.5 liter bottles upright it is an unanswered question.
Close prices, same category: comparable camping gear. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Box type | Capacity | Insulation type | Insulation thickness |
|---|---|---|---|---|---|
| BRILLIRARE Collapsible 39 L ice chest | $40 | A collapsible rigid box — EPP foam walls that fold, stated to save up to 80 per cent of their space when packed down. It is the only folding rigid box on this shelf; the other rigid boxes here are fixed shells and the folding products are soft bags | 39 L — stated, given also as 10.3 US gallons and as 60 small bottles or jars. It is the largest capacity published on this shelf, above the 33 L soft bag and the 30 L group | EPP foam — expanded polypropylene, named, and described as owing its insulation to small bubbles in its structure, with a waterproof surface layer over it | Not published. In its place the listing gives a thermal conductivity coefficient of 0.028, which is the only conductivity figure published anywhere on this shelf. A conductivity tells you how well the material insulates; a thickness tells you how much of it there is, and without the second the first cannot be turned into a wall |
| Quiksilver QK-CB12-TPC | $50 | A soft box cooler — a structured bag that holds its shape, stated as a soft cooler rather than a rigid shell | 18 L — stated, with up to 24 cans plus ice. The liter figure and the can figure are both given, which half the listings on this shelf do not manage | Not named. The listing states advanced insulation technology and a high-performance thermal lining, and names no foam, foil or laminate | Not published |
| BAGLHER Cooler backpack, 25 L | $25 | A soft insulated backpack — the only listing on this shelf carried on two shoulders. Three European bags here offer a shoulder strap; none is a two-strap pack | 25 L — stated, with up to 30 cans of 330 ml, and external dimensions of 13 × 8 × 17 in. Those are the only external dimensions published by an American listing on this shelf | Not named. The listing states insulation material and a leak-proof liner working together, and does not say what either is made of. Several of the four listings on this shelf name their insulation; this is not one of them | Not published |
| Pinnacle PIB-450B | $24 | A rigid passive box with a flip-top lid — no power, no ice packs supplied. One of two rigid American boxes on this shelf | Published twice, and the two do not agree: the title says 4.5 to 11 liters, and the fourth bullet says this picnic cooler has a 4.5 liter capacity. Four point five liters is the smallest capacity published on this shelf; eleven would still be among the smallest | Polyurethane foam — named, with BPA-free materials stated for the shell | 20 mm (0.79 in) — stated. It is the thickest insulation published anywhere on this shelf, and one of only two thickness figures on it; the European Lifewit bag publishes 8 mm (0.31 in) of EPE |
A car boot where the box has to fold flat between trips and volume matters more than the seal
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.
Soft folding basket · 15 × 9.4 × 9.8 in (38 × 24 × 25 cm) open · heat-sealed lining · zip closure · 66 lb (30 kg) stated load · no liter figure published
A folding insulated shopping basket with an aluminum frame and a stated 66 lb (30 kg) load, and the only listing in this hub that publishes no capacity in liters at all.
Best for: Carrying a full grocery run from car to table, where the frame and the handles do more work than the cooling does.
Soft insulated backpack · 25 L, 30 cans · 13 × 8 × 17 in · 16 h cold or hot · 1.65 lb empty, the lightest published here · leakproof liner · zips · six pockets
The only cooler on this shelf carried on both shoulders, and the several of the four listings anywhere here that publish an empty weight — 1.65 pounds, with six pockets and a leakproof liner.
Best for: A walk-in pitch or a cycle ride, where the cold has to travel on your back and not in your hand
≈ $25
Rigid passive box · 22 L (23 qt) · 10.8 × 17.5 × 15.1 in · four 15 oz (450 ml) ice packs in the lid · 40 h cold / 18 h warm stated · 2.4 lb · PU/PP
The longest cooling figure published by a European listing in this hub at 40 hours, and the listing itself says the number rests on the four ice packs built into its lid.
Best for: A weekend where the box is packed once and opened rarely, and the ice packs are frozen properly beforehand.
