The short answer (prices checked 5 November 2026)
- Best overall is the Contigo Byron Snapseal, 470ml, £9.00 on 5 November 2026. Spread over a year of weekday mornings that is about 4.7p a fill.
- Cheapest on the shortlist is the OTTO KONING 350ml at £6.99, about 3.6p a fill.
- For a car cup holder, the Contigo West Loop Autoseal at £23.54, about 10.3p a fill.
- The £6.99 mug and the £35.00 Stanley claim the same four hours hot.
- Audit finding: of the first twenty unsponsored amazon.co.uk results for "travel mug" read on 5 November 2026, sixteen print an hours figure. None of the twenty names a standard, a starting temperature or a fill level.
A travel mug was sitting at number 9 in Amazon UK's Home and Kitchen bestseller chart on 5 November 2026. It is the Contigo Byron Snapseal, 470ml, and the words "7h hot" are written into the product name itself. The clocks went back on 25 October, the commute is dark at both ends now, and what people want is a drink that is still warm when they arrive.
So the hours figure is doing the selling. We read the first twenty unsponsored results for "travel mug" on amazon.co.uk the same morning to see where that number comes from. The answer is that it comes from the maker, and nothing on the page says how.
Prices in this table come from Amazon and are refreshed at least once a day, with the date of the last update under the table. The cost-per-use and running-cost figures on this page use prices Look Into read on 5 November 2026, so they can differ from today's price.
As an Amazon Associate, Look Into earns from qualifying purchases. Product prices and availability are accurate as of 5 November 2026 10:39 am and are subject to change.
Prices and specs last checked by Look Into on 5 November 2026 · next check 31 December 2026 · how we picked
Where the hours figure comes from
There is a British Standard for this kind of product. BS EN 12546-1:2000, "Materials and articles in contact with foodstuffs. Insulated containers for domestic use. Specification for vacuum ware, insulated flasks and jugs", is listed by BSI as current, sits with committee CW/29 and runs to fourteen pages. The European text behind it says it sets requirements for vacuum ware and other insulated flasks for domestic use. Part 2 of the same series covers insulated bags and boxes and expressly excludes flasks and jugs, so flasks are Part 1's business. A laboratory that runs the schedule, the Societe Francaise de Ceramique, lists heat loss among the checks it carries out against NF EN 12546-1.
Nothing requires an Amazon listing to mention any of that, and none of the twenty we read does. No listing gives the temperature the drink started at. No listing says whether the mug was full. Both matter, because a part-filled mug holds less heat to begin with and has a bigger pocket of air above the drink, so it cools faster. Sixteen of the twenty print an hours figure anyway, and the figures run from four hours to seven.
How we picked these
Six mugs, all drawn from the same twenty listings, each doing a job the others do not. We kept the price spread wide on purpose, from £6.99 to £35.00, because the hours claims do not rise with the price. Look Into has not handled these products: every figure comes from the maker, the listing or a named source, read on the date shown.
How they compare
| Mug | Size | Price, 5 Nov 2026 | Hot hours claimed | Cost per fill, year one |
|---|---|---|---|---|
| Contigo Byron Snapseal | 470ml | £9.00 | 7 | about 4.7p |
| OTTO KONING | 350ml | £6.99 | 4 | about 3.6p |
| THERMOcafe by Thermos | 420ml | £9.99 | none stated | about 4.9p |
| Thermos Icon Rock Cap | 470ml | £19.99 | 7 | about 8.9p |
| Contigo West Loop Autoseal | 470ml | £23.54 | 5 | about 10.3p |
| Stanley 1913 Aerolight Transit | 350ml | £35.00 | 4 | about 14.4p |
Contigo Byron Snapseal, 470ml
£9.00 on 5 November 2026 · 470ml · listing claims 7 hours hot, 12 cold
This is the mug that put travel mugs in the chart this week. The lid slides up to drink and down to lock with one hand, which is the whole argument for it when the other hand has a bag in it. At nine pounds it is the cheapest route to the longest hot claim on this page, and the body is vacuum-insulated stainless with a plastic lid.
The catch: the sliding lid has a gasket that lifts out for washing, and the channel it sits in is exactly where coffee oils collect. If you will not take the lid apart weekly, buy the screw-top instead.
OTTO KONING Travel Mug, 350ml
£6.99 on 5 November 2026 · 350ml · listing claims up to 4 hours
Seven pounds buys a silicone-sealed screw lid and an 18/8 stainless body. The listing claims four hours hot or cold, which is the same claim the thirty-five pound Stanley makes. That comparison is the single most useful thing on this page if you were about to spend thirty pounds.
The catch: a screw lid means two hands, so it is the wrong mug for a train platform. The seller is not a brand with a service history behind it, and the four hour figure is the lowest here.
Contigo West Loop Autoseal, 470ml
£23.54 on 5 November 2026 · 470ml · listing claims 5 hours hot, 12 cold
The Autoseal button seals the mug between sips rather than leaving it open while you drive, and there is a lock to stop the button being pressed in a bag. Same 470ml as the Byron, same maker, a different idea about what a lid is for.
The catch: it costs two and a half times the Byron and claims two fewer hot hours, five against seven. The button mechanism also has more places for milk to sit than a slide lid does.
Thermos Icon Rock Cap, 470ml
£19.99 on 5 November 2026 · 470ml · listing claims 7 hours hot, 22 cold
Seven hours hot from the company whose name became the word for the product. The listing says it fits standard cup holders, has a non-slip base and uses a commercial grade stainless steel body, and the lid is described as leak-proof.
The catch: twenty-two hours cold against seven hot is a wide gap, and the cold number is the one doing the marketing work. If you want it for tea in February, the seven is the number that applies.
THERMOcafe by Thermos soft touch travel mug
£9.99 on 5 November 2026 · 420ml in the title · no hours figure given
Stainless inside, soft-touch plastic outside, slide-lock lid, foam base to stop it skating across a dashboard. It is one of only four listings in the twenty that declines to put an hours number on the box, which is either honesty or an oversight, and either way it is unusual.
The catch: the listing contradicts itself on size. The product title says 420ml and the listing's own details table says 400ml. With no hours figure at all, you are buying on the Thermos name rather than on a stated number.
Stanley 1913 Aerolight Transit, 0.35L
£35.00 on 5 November 2026 · 350ml · listing claims 4 hours hot, 6 cold
Stanley's argument for the Aerolight is weight: lightweight double-wall vacuum insulation, leakproof lid, dishwasher safe, in a line that has been going since 1913. If a mug lives in a rucksack all day the grams are a real consideration.
The catch: it is the dearest mug here by eleven pounds and it makes the shortest hot claim on the shortlist, four hours, the same as the £6.99 one. You are paying for the weight saving and the name, not for the insulation figure.
What the twenty listings actually say
Scope and date: the first twenty unsponsored results for "travel mug" on amazon.co.uk, read on 5 November 2026. We looked only inside the product title, the bullet list, the technical specification tables and the product description. Sponsored placements were skipped.
- Sixteen of the twenty state how long a drink stays hot. The figures run from four hours to seven.
- Zero of the twenty name a standard or a method for that figure.
- Zero of the twenty give the temperature the drink started at.
- Zero of the twenty say what fill level the figure assumes.
- Four give no hours figure at all. Three of those four are the established names on the page: YETI, Bodum and Thermos under its THERMOcafe line.
The practical reading is that an hours figure is a marketing number, not a measured one you can hold anybody to. Within a single maker it is probably comparable, since Contigo's seven and five are presumably arrived at the same way. Across makers it is not, and the four hours on a seven pound mug and the four hours on a thirty-five pound one are not evidence that the two perform alike.
What a fill costs
Two numbers, both plain arithmetic, and both stated here so you can check them.
The electricity first. Raising water from 15°C to boiling takes 4.186 kilojoules per kilogram per degree, a rise of 85 degrees, so 470ml needs about 0.0465 kWh. At the Ofgem price cap unit rate for 1 October to 31 December 2026 that is 1.2p a fill. A 420ml mug needs about 0.0415 kWh, or 1.1p. A 350ml mug needs about 0.0346 kWh, or 0.9p. That assumes you boil only what you pour. Fill the kettle to its minimum line when you want one mug and the figure goes up, which is its own small argument for a big mug.
The mug is the bigger number in the first year. Spread the £9.00 Contigo over 260 weekday mornings and it costs 3.5p a fill. The £35.00 Stanley costs 13.5p. Add the electricity and year one runs from about 3.6p a fill for the OTTO KONING to about 14.4p for the Stanley. From the second year on the mug is free and only the kettle is left, which is why the sensible question is not which mug is cheapest but which one you will still be using in three winters.
Questions people ask
Will a travel mug really keep coffee hot for seven hours?
Seven hours is the maker's own figure, and the listing does not say how it was arrived at or from what starting temperature. Read it as the best case: filled to the top, lid shut, left alone indoors. Opening it every twenty minutes on a cold platform is a different situation entirely, and nobody publishes a number for that.
Is there an official method behind the claim?
There is a British Standard for insulated flasks and jugs, BS EN 12546-1:2000, and a laboratory schedule built on it that includes a heat loss check. Nothing obliges an Amazon listing to cite either, and none of the twenty we read on 5 November 2026 does.
Does it matter how full the mug is?
Yes. Less liquid means less stored heat and a larger air space above it, so a half-full mug cools quicker than a full one of the same design. Not one of the twenty listings states the fill level its hours figure assumes, so the figures are not directly comparable with each other either.
Do these fit a car cup holder?
The Thermos Icon says it fits standard cup holders, the THERMOcafe says it fits most vehicle cup holders, and the OTTO KONING says it fits most car cup holders. The Stanley Aerolight and the two Contigos do not make that claim in the sections we read, which is not the same as saying they do not fit.
Is a cheap travel mug worse?
On the evidence printed on these twenty listings, you cannot tell. The £6.99 mug and the £35.00 mug claim the same four hours. Price here buys lid design, weight, materials and a warranty you can actually call on, and those are reasonable things to pay for. It does not visibly buy stated hours.
Sources
- BSI listing for BS EN 12546-1:2000, insulated containers for domestic use, specification for vacuum ware, insulated flasks and jugs, read 5 November 2026
- EN 12546-1:2000 scope, read 5 November 2026
- EN 12546-2:2000, insulated bags and boxes, which excludes flasks and jugs, read 5 November 2026
- Societe Francaise de Ceramique, insulating containers for domestic use, listing heat loss under NF EN 12546-1, read 5 November 2026
- Amazon.co.uk Best Sellers, Home and Kitchen, read 5 November 2026
- Ofgem energy price cap, read 5 November 2026. The unit rate used here is the direct debit average for 1 October to 31 December 2026, held in this site's rates table.
Prices in the text, the cards and the page data were read from the listings on 5 November 2026 and will have moved since. The comparison table above the picks is a live feed. Look Into is an Amazon Associate and earns from qualifying purchases made through the links on this page, at no extra cost to you.