Retention hours only compare when the stated conditions match · review
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.
An 8 oz insulated flask with a removable shot cup, orange.
EcoVessel states food-grade stainless steel construction on a rugged 8 oz flask; a removable 3 oz silicone cup that fits into the base, to remove, pour and share; a discreet folding handle lid that clips to backpacks and golf bags; TriMax triple insulation keeping drinks at the perfect temperature for up to 24 hours; and both the flask and the removable cup stated dishwasher safe.
No steel grade. No hot and cold separated. No conditions. No mouth figure. No base figure. No finish. No weight.
TriMax, undescribed.
Every other listing here states a double wall, and this shelf’s introduction opens on the assumption that the physics is shared across the category.
A third layer is either a real additional barrier or a name for a lining inside the existing vacuum. The page does not say which.
Twenty-four hours at the perfect temperature.
Every other listing in this group separates them, almost always as 12 hours hot and 24 cold.
A single number covering hot and cold is a weaker statement than two, and the introduction above explains why: each figure comes from conditions the maker sets, and hot and cold are not symmetrical problems.
Two people, one flask.
Three ounces of silicone comes out of the bottom, so whisky, wine or coffee gets poured rather than passed.
The handle is hidden until it is needed, and clips the flask to a pack or a golf bag.
It is the second cup arrangement in this group. The Thermos flask in this group has a stainless cup built into its lid; this one is a separate part in the base, which is a part that can be lost.
The American Amazon store was listing it at about $10 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 | 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 |
|---|---|
| Wall construction | 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 |
| Steel grade | Not named. Food-grade stainless steel is stated, described as rugged, and no 18/8 or 304 figure appears |
| Hot retention | 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 |
| Cold retention | Not published separately — covered by the same single 24-hour statement. Every other listing in this group separates the two figures, usually as 12 hours hot and 24 cold |
| 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, and the mouth is not described as wide or narrow. At 8 oz with a shot cup in the base, it is a pouring flask rather than a drinking bottle |
| Lid type | A hidden folding handle lid — stated discreet, so the flask clips to a backpack or a golf bag and the handle folds away when not in use. The removable 3 oz silicone cup is separate, in the base |
| Seal availability | Not published |
| Base diameter | Not published. The base holds the removable silicone cup, so the footprint is the cup’s outside diameter — and no figure is given for either |
| Finish | Not stated beyond the color. No powder coat and no matte or brushed finish is named |
| Empty weight | Not published |
| Amazon reference | B0DMXB3CN7 |
| EAN | 0755247217987 |
The claim is the only one of its kind on this shelf, and the page does not describe what the third layer is. This shelf's introduction opens on the observation that every vacuum flask claims the same physics — a vacuum between two skins of steel — so a third wall is either a genuine additional barrier or a marketing name for a copper or ceramic lining inside the existing vacuum. TriMax is the maker’s trade name and nothing here unpacks it. What is published is a single 24-hour figure with no separation between hot and cold, which is a weaker statement than the 12-and-24 pair every other listing in this group gives.
Sharing, and pouring. A 3 oz silicone cup fits into the base of the flask, comes out, and lets two people drink from an eight-ounce flask of whisky, wine or coffee without passing a mouthpiece. The listing offers exactly those uses. It is the second of two cup arrangements in this group — the Thermos has a built-in stainless serving cup over its stopper — and the two are different: that one is part of the lid, this one is a separate part in the base, which means it is a part that can be lost.
It is a hip flask, and it is the smallest thing on this shelf by a long way: the rest of this group runs from 16 to 40 ounces, and the European side reaches a liter. Eight ounces is one strong coffee or three measures of spirits, and the folding handle and the clip are there because it travels in a pocket or on a bag rather than in a bottle cage. Judged as a water bottle it is useless. Judged as what it is — a shared drink at the top of a hill, dishwasher safe when you get home — it is coherent at ten dollars.
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 |
|---|---|---|---|---|---|
| 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 |
| 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 |
| 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 hip-pocket flask for spirits or a single coffee, where two can share from one cup
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.
40 oz · vacuum insulated · food-grade stainless, grade not named · 12 h hot and 24 h cold stated · wide mouth, stated to take ice · straw, chug and handle lids · matte powder coat · twelve dollars
Three lids — straw, twist spout and carry handle — on a forty-ounce wide-mouth bottle with a matte powder coat, for twelve dollars.
Best for: A gym bag and a car boot both, where one bottle has to be a straw bottle, a pour bottle and a carry bottle
≈ $12
