Retention hours only compare when the stated conditions match · review
Three lids — straw, twist spout and carry handle — on a forty-ounce wide-mouth bottle with a matte powder coat, for twelve dollars.
A 40 oz vacuum bottle with three lids, sky blue.
Fanhaw states advanced vacuum insulation keeping drinks hot for 12 hours or ice-cold for 24; three lids — a flip-up straw lid, an easy-twist spout lid and a portable handle lid — all leak-proof and designed for one-handed sipping or hands-free drinking; food-grade stainless steel resisting rust, dents and odors, with a matte powder-coated finish for grip and a wide-mouth opening stated to make adding ice and cleaning effortless; and availability in 18, 24, 32, 40 and 64 oz.
No steel grade. No conditions. No base figure. No seal availability. No weight.
Straw, spout, handle.
The straw drinks without tipping the bottle. The spout pours, and suits a hot drink. The handle carries forty ounces from a car to a pitch.
This shelf’s introduction calls the lid both the part that leaks and the part that fails. Three of them is a form of spare.
Three of them is also three gaskets, and nothing here says whether seals can be bought.
The one specification everything else here gives.
Every other American listing in this group states 18/8. One states 18/8 of 304.
This page says food-grade stainless steel, with rust and odor resistance claimed, and no grade.
This shelf’s introduction opens on the point that every flask claims the same physics. The steel grade is one of the few places a real difference could appear.
A bag bottle, not a cup-holder bottle.
No listing on this shelf publishes a base diameter. This one makes no cup-holder claim either.
The Iron Flask in this group at least states which of its sizes fit: 14, 18 and 22 oz. Forty ounces is 1.18 liters, and the largest bottle in this group.
The American Amazon store was listing it at about $12 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 | 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 |
|---|---|
| Wall construction | Advanced vacuum insulation — stated, with no layer count. The word vacuum is used, which two listings on this shelf avoid |
| Steel grade | 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 |
| Hot retention | 12 hours — stated. The common figure on this shelf |
| Cold retention | 24 hours — stated, described as ice-cold. 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, and stated to make adding ice cubes and cleaning effortless — which is the pair of uses this shelf's introduction gives for a wide mouth |
| Lid type | Three lids supplied — a flip-up straw lid, an easy-twist spout lid, and a portable handle lid. All three are stated leak-proof and designed for one-handed sipping or hands-free drinking. It is the fullest lid set in this group |
| Seal availability | Not published. With three lids, each carrying its own gasket, that is three seals whose replacement is unaddressed |
| Base diameter | Not published, and no cup-holder statement is made. At 40 oz it is the largest bottle in this group |
| Finish | A matte powder-coated finish — stated, and stated to offer a secure grip. This shelf's introduction notes that a powder coat resists chipping and adds grip where bare steel shows every knock |
| Empty weight | Not published |
| Amazon reference | B0FVWYV6WD |
| EAN | 0619165378307 |
Yes, more than a second bottle would be. The three here cover genuinely different uses: a flip-up straw for drinking without tipping the bottle, an easy-twist spout for pouring and for hot drinks, and a handle lid for carrying a full forty ounces from a car to a pitch. This shelf's introduction makes the point that the lid is both the part that leaks and the part that fails, so having spares of a sort is useful in itself. The unanswered half is seals: three lids are three gaskets, and nothing on this page says whether replacements can be bought.
It is the one specification this listing drops that the rest of this group all state. Everything else here says 18/8 — two parts chromium to one nickel — and one says 18/8 of 304, the AISI number. This page says food-grade stainless steel and leaves it there. In practice almost all vacuum flasks at this price are 304, and the listing does claim resistance to rust and odors, which is what the nickel content buys. But this shelf's introduction opens on the point that every flask claims the same physics, so the grade is one of the few places a difference could show, and here it is not shown.
Not a cup holder, almost certainly. No listing on this shelf publishes a base diameter, and this one makes no cup-holder claim at all — where the Iron Flask in this group states that only its 14, 18 and 22 oz versions fit. Forty ounces is 1.18 liters and the largest bottle in this group, so treat it as a bag or a boot bottle. This shelf's buying tip asks you to check the base against your holder before ordering, and on this listing the check has to be done with a tape measure on the holder and a guess on the bottle.
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 |
|---|---|---|---|---|---|
| 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 |
| EcoVessel 8 oz with shot cup | $10 | 8 oz — stated, about 240 ml, with a separate 3 oz silicone cup that fits into the base. It is the smallest capacity on this shelf by a wide margin, where the rest run from 16 to 40 oz and the European side reaches a liter | TriMax triple insulation — stated by name. It is the only triple-wall claim on this shelf; every other listing here states a double wall, and this shelf's introduction opens on the assumption that the physics is shared. No layer materials are described | Not named. Food-grade stainless steel is stated, described as rugged, and no 18/8 or 304 figure appears | Not published separately. The listing states that drinks are kept at the perfect temperature for up to 24 hours, without saying whether that applies to hot, to cold, or to both — and this shelf's introduction notes that each figure comes from conditions the maker sets |
| IRON °FLASK 32 oz narrow mouth | $9 | 32 oz — stated, about 950 ml. The maker’s own wide-mouth listing states that only its 14, 18 and 22 oz versions fit a car cup holder, so a 32 oz bottle from this range does not | Double wall insulation — stated, and credited with keeping the outside sweat-free with cold drinks. No vacuum is named in so many words, and no layer count beyond two | 18/8 stainless steel — stated as premium, BPA-free and non-toxic, and stated never to leave a metal taste or rust. The AISI number behind 18/8 is not given, where one listing in this group names 304 | Up to 12 hours — stated. It is the common figure on this shelf: several of the twelve listings here claim 12 hours or less, and one claims 18 |
| Mont-Clair 500 ml double-walled flask | $8 | 500 ml — stated in the title | Double-walled insulation — stated; the listing does not use the word vacuum | Not published on the listing — the flask is called 100% stainless steel, with no grade named | Not published on the listing — the listing says drinks are held hot or cold, with no number of hours |
A gym bag and a car boot both, where one bottle has to be a straw bottle, a pour bottle and a carry bottle
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
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
