Retention hours only compare when the stated conditions match · review
The only listing in this group to name the AISI number behind 18/8 — 304 — with two lids split by use, a silicone base boot and a limited lifetime warranty.
A 32 oz powder-coated flask with a straw lid and a spout lid.
honogo states double-layered vacuum insulation keeping drinks cold up to 24 hours and hot up to 12 with fresh taste, 100 per cent sweat free; premium 18/8 of 304 stainless steel, non-toxic, BPA-free and phthalate-free, stated never to leave a metal taste or rust; two lids — a straw lid for icy cold drinks and a 100 per cent leak-proof spout lid for hot coffee, both with a wide handle — with a bonus silicone boot sleeve; and a limited lifetime warranty against manufacturing defects.
No conditions. No mouth figure. No base figure. No seal availability. No weight.
Eighteen eight of three-oh-four.
Eighteen per cent chromium and eight per cent nickel is a composition. AISI 304 is the grade that composition belongs to.
Every other listing here stops at the ratio, or — on one page — at food grade.
This shelf’s introduction says every flask claims the same physics, which makes the steel, the coat and the lid the places a real difference can show.
Straw for cold, spout for hot.
No other listing in this group says which lid is for which. The assignment is the right one: a straw is poor in a hot drink, and a spout pours.
The spout lid is stated 100 per cent leak-proof. Both lids carry a wide handle.
Two layers where the bottle lands.
The base takes the knocks — rock, concrete, a tailgate — and the silicone sleeve takes them first.
It is the only base boot in this group.
It also widens the base, and no listing on this shelf publishes a base diameter. This shelf’s buying tip asks you to check that against your cup holder; here the boot comes off for it.
The American Amazon store was listing it at about $20 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.
| Capacity | 32 oz — stated, about 950 ml, and stated in both the title and the bullets |
|---|---|
| Wall construction | Double-layered vacuum insulation — stated, with the bottle described as 100 per cent sweat free and free of condensation |
| Steel grade | 18/8 of 304 stainless steel — stated, with non-toxic, BPA-free and phthalate-free claims. It is the only listing in this group to give the AISI number behind 18/8; on the European side one listing distinguishes SUS 201 outside from SUS 304 inside |
| Hot retention | Up to 12 hours — stated, with fresh taste claimed. The common figure on this shelf |
| Cold retention | Up to 24 hours — stated. The standard claim across this shelf |
| Retention conditions stated | Not published — no starting temperature, no ambient temperature, no threshold. No listing on this shelf publishes them |
| Mouth diameter | Not published as a figure. The mouth is stated to be wide in the title, and ice cubes are recommended for the coldest drink, which is the use a wide mouth exists for |
| Lid type | Two lids supplied and split by use — a straw lid for icy cold drinks, and a 100 per cent leak-proof spout lid for hot coffee, both with a wide handle. The listing is the only one in this group to say which lid is for which drink |
| Seal availability | Not published, although a limited lifetime warranty against manufacturing defects is stated — which covers a failed gasket on arrival and not a worn one in three years |
| Base diameter | Not published, and no cup-holder statement is made. A bonus silicone boot sleeve is supplied for the base, which will add to whatever the diameter is |
| Finish | Powder coated — stated in the title, with a silicone boot sleeve supplied over the base. That is two layers of knock protection, and this shelf's introduction notes that a powder coat resists chipping and adds grip |
| Empty weight | Not published |
| Amazon reference | B08QFC4KZ6 |
| EAN | 0746092278605 |
Because 18/8 is a composition and 304 is the alloy specification, and only one listing in this group gives the second. Eighteen per cent chromium and eight per cent nickel is what makes the steel resist corrosion and stops it tainting a drink; AISI 304 is the standard grade that composition belongs to, so naming it is a slightly firmer statement than naming the ratio. This shelf's introduction opens on the point that every flask on the shelf claims the same physics, which makes the few genuinely checkable specifications — the steel, the coat, the lid — the ones worth reading. On the European side of this shelf one listing goes further still, distinguishing a cheaper SUS 201 outer skin from a 304 inner one.
Two here, and the useful thing is that the listing says what each is for: the straw lid for icy cold drinks, the spout lid — stated 100 per cent leak-proof — for hot coffee. No other listing in this group assigns its lids to drinks, and the assignment is sensible, because a straw in a hot drink is a poor idea and a spout pours. Two listings in this group supply three lids instead, adding a carry handle or a steel cap. Both lids here carry a wide handle, so the carrying function is not lost.
It takes the knocks the base gets when the bottle is set down on rock, concrete or a tailgate, and it stops the bottle ringing and sliding. Over a powder coat that is two layers of protection, and it is the only base boot in this group. The side effect is the one this shelf's buying tip cares about: a boot widens the base, and no listing on this shelf publishes a base diameter, so if the bottle has to stand in a cup holder you are now guessing at a figure plus a sleeve. The boot comes off for that.
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 | Capacity | Wall construction | Steel grade | Hot retention |
|---|---|---|---|---|---|
| honogo 32 oz, two lids | $20 | 32 oz — stated, about 950 ml, and stated in both the title and the bullets | Double-layered vacuum insulation — stated, with the bottle described as 100 per cent sweat free and free of condensation | 18/8 of 304 stainless steel — stated, with non-toxic, BPA-free and phthalate-free claims. It is the only listing in this group to give the AISI number behind 18/8; on the European side one listing distinguishes SUS 201 outside from SUS 304 inside | Up to 12 hours — stated, with fresh taste claimed. The common figure on this shelf |
| magcheer 1-liter wide-mouth vacuum flask | $22 | 1 liter — stated in the title | Double-wall vacuum insulation — stated | 18/8 stainless steel — stated, described as food grade and non-toxic | 12 hours — stated |
| Thermos Stainless King SK2000 | $26 | 16 oz — stated, about 470 ml, described as compact. The maker states that the Stainless King also comes in 40 oz and 68 oz. It is the second-smallest capacity in this group | Vacuum insulation — stated as the maker’s own technology, with the exterior stated to stay cool to the touch with hot drinks and sweat-free with cold. No layer count beyond the vacuum | 18/8 stainless steel — stated as high quality, for the body and for the built-in cup | 18 hours — stated twice, in the bullets and in the description. It is the longest hot retention published on this shelf: the other fourteen listings claim 12 hours or less, and one European listing claims 13 hours of stability without separating hot from cold |
| Fanhaw 40 oz, three lids | $12 | 40 oz — stated, about 1.18 liters. The listing adds that 18, 24, 32, 40 and 64 oz versions exist, which confirms that capacity is a variant of one listing in this category rather than a separate product | Advanced vacuum insulation — stated, with no layer count. The word vacuum is used, which two listings on this shelf avoid | Not named. Food-grade stainless steel is stated, with resistance to rust, dents and odors, and no 18/8 or 304 figure. It is the only American listing in this group not to state 18/8 | 12 hours — stated. The common figure on this shelf |
A bottle that will get knocked about, where a base boot and a named steel grade are worth more than a third lid
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
