Insulation thickness and lid discipline, not the liter figure · review
The thickest insulation published anywhere on this shelf — 20 mm (0.79 in) of polyurethane — and a 48-hour claim, on a box whose own title and bullets disagree about how many liters it holds.
A rigid picnic cooler with a flip-top lid, blue or lime green.
Pinnacle states BPA-free materials insulated with 20 mm (0.79 in) polyurethane foam to keep food and drinks colder for longer, and contents cool for 48 hours; a swing-up handle ergonomically designed for comfort while carrying; a flip top lid that seals tightly for freshness and can be completely flipped upside down to hold drinks while you unload; and a 4.5 liter capacity in the fourth bullet, against 4.5 to 11 liters in the title.
No conditions. No gasket. No drain. No empty weight. No internal dimension.
The number this shelf’s introduction asks for first.
Insulation type and thickness comes before the liters. A rigid box with thick foam walls and a soft bag with a thin foil liner both quote a capacity, and they are not the same product.
Thirteen listings sit on this shelf. Two publish a thickness. This one gives 20 mm of polyurethane; a European soft bag gives 8 mm (0.31 in) of EPE.
Four point five to eleven liters, or four point five.
The title says the first. The fourth bullet says the second, in a sentence about sizing.
Four point five liters is the smallest figure on this shelf, where the rest run from 18 to 39.
This shelf’s buying tip calls that unquoted.
No fill ratio. No ambient temperature. No ice quantity. The same is true of all thirteen listings here.
Two of them claim 48 hours: this rigid box with a 20 mm (0.79 in) wall, and an 18 liter soft bag. The claim is the same and the product is not.
The American Amazon store was listing it at about $24 at the time of writing.
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 8, 2026. The live price is at the top of the page.
| Box type | A rigid passive box with a flip-top lid — no power, no ice packs supplied. One of two rigid American boxes on this shelf |
|---|---|
| Capacity | 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 |
| Insulation type | Polyurethane foam — named, with BPA-free materials stated for the shell |
| Insulation thickness | 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 |
| Ice retention | 48 hours — stated in the title and in the second bullet, as keeping contents cool for 48 hours. It is the joint longest claim on this shelf, level with the 18 L Quiksilver bag in this group |
| Ice retention conditions | Not published — no fill ratio, no ambient temperature, no ice quantity. No listing on this shelf publishes them, which is exactly what this shelf's buying tip warns about: two makers quoting 48 hours may have tested nothing alike |
| Closure and seal type | A flip-top lid, stated to seal tightly for freshness, and able to be flipped completely upside down so it holds drinks while you unload. No gasket is named |
| Drain | Not published. No listing on this shelf publishes one |
| Carry arrangement | A swing-up handle, stated ergonomically designed for comfort when carrying. No strap and no wheels |
| Empty weight | Not published |
| Amazon reference | B09885BDRZ |
| EAN | 0682622001551 |
The page says both. The title reads 4.5 to 11 Liter and offers the box as small to medium; the fourth bullet says plainly that this picnic cooler has a 4.5 liter capacity. The likeliest explanation is that the listing covers two sizes and the bullets describe only the smaller, but the listing does not say so, and the price is one price. Four point five liters is a lunch for two; eleven is a picnic. Both figures sit at the bottom of this shelf, where the other twelve listings run from 18 to 39 liters, so the box is small either way — and if you need the larger one, the capacity is the thing to confirm before ordering.
For keeping cold, thickness is the figure that matters, and this is the only listing on this shelf that publishes a useful one. Twenty millimeters of polyurethane is a genuine wall; the only other thickness anywhere here is 8 mm (0.31 in) of EPE foam on a European soft bag. This shelf's introduction makes the point directly — a rigid box with thick foam walls and a soft bag with a thin foil liner both quote a capacity, and they are not the same product. What you give up for the wall is interior: 20 mm (0.79 in) of foam on every face of a small box is a lot of the outside dimension.
Treat it as unquoted, which is what this shelf's buying tip asks of any retention figure with no conditions beside it. No fill ratio, no ambient temperature and no ice quantity appear on this page — and none appears on several of the four listings on this shelf, so the whole column is empty. Two listings here claim 48 hours: this rigid box with 20 mm (0.79 in) of polyurethane, and an 18 liter soft bag. They cannot both mean the same thing by it, and neither says what it means. What is comparable is the wall: this is the only one that publishes it.
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 |
|---|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
A lunch or a short picnic where the wall thickness matters more than the volume
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.
Collapsible rigid box · 39 L, the largest on this shelf · EPP foam, 0.028 conductivity stated · 24 h cold and 12 h warm · buckle lid the maker says leaves gaps · no drain · no thickness
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.
Best for: A car boot where the box has to fold flat between trips and volume matters more than the seal
≈ $40
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
