We analysed the Amazon.co.uk subcategory Vacuum Flasks — double-walled insulated bottles, travel mugs and tumblers, not the hip flasks sold as barware — and kept only products with at least 200 reviews and 4.3 stars. Ranked by estimated monthly revenue, the ten below run from £8.52 to £46.62, and two of them state in their own titles that they are not leakproof.
The revenue leader: a 500 ml insulated steel bottle at £19.97, listed as leakproof and dishwasher safe, with a cleaning brush in the box.
Check the price on AmazonThe revenue leader: a 500 ml insulated steel bottle at £19.97, listed as leakproof and dishwasher safe, with a cleaning brush in the box.
A 295 ml wine tumbler at £25 with a five-year warranty — and the title says plainly that the MagSlider lid is not leakproof, so it does not travel in a bag.
The most expensive entry at £46.62 and the largest bottle here: 1,180 ml with a wide mouth and a leak proof Flex Cap.
A 480 ml stainless mug at £37.99 that opens with one button rather than a screw cap, and whose price rose 20% over the observed period.
With 23,084 reviews this is the most reviewed listing on the page, and the only one whose title states a hold time — up to five hours warm, written in German on the UK store.
The cheapest entry at £8.52 after a 25% drop, and a straightforward double-walled 380 ml mug with a leakproof lid.
The odd one out: a 5 litre pump-action air pot for £17.84, made to stand on a table and serve a room rather than travel in a bag.
A 473 ml stackable cup at £28 after a 31% drop — the second YETI here and, like the first, described in its own title as not leakproof.
The 750 ml Chilly's at £29 — leak proof, no condensation on the outside, and one of 70 size and colour variants that all share a single review pool.
A 420 ml desk mug at £11.66, inexpensive for this category, but the price had already risen 64% over the observed period.
| Product | Score | Stars | Reviews | Feature | Material | Price | Offer |
|---|---|---|---|---|---|---|---|
| 01. Blockhütte Insulated Water Bottle, 500 ml Best seller Blockhütte · Blockhütte |
9.2 | 4.7 ★ | 4,732 | 500 ml · leakproof | Stainless steel | £19.97 | Amazon › |
| 02. YETI Rambler Wine Tumbler, 295 ml YETI · YETI |
8.5 | 4.6 ★ | 567 | 295 ml · wine tumbler | Stainless steel | £25.00 | Amazon › |
| 03. Hydro Flask Wide Mouth Bottle, 1180 ml Top rated Hydro Flask · Hydro Flask |
9.5 | 4.7 ★ | 21,123 | 1180 ml · wide mouth | Stainless steel | £46.62 | Amazon › |
| 04. Zojirushi Stainless Mug, 480 ml One-Touch ZOJIRUSHI · ZOJIRUSHI |
9.0 | 4.7 ★ | 2,458 | 480 ml · one-touch | Stainless steel | £37.99 | Amazon › |
| 05. Contigo West Loop Autoseal Mug, 470 ml Contigo · Contigo |
9.2 | 4.5 ★ | 23,084 | 470 ml · autoseal | Stainless steel | £22.99 | Amazon › |
| 06. Tlater Thermal Mug, 380 ml Double Wall Lowest price Tlater · Tlater |
8.6 | 4.4 ★ | 3,027 | 380 ml · double wall | Stainless steel | £8.52 | Amazon › |
| 07. Crystals Pump Action Air Pot Flask, 5 L Crystals · Crystals |
8.2 | 4.3 ★ | 1,355 | 5 L · pump action | Steel and plastic | £17.84 | Amazon › |
| 08. YETI Rambler Stackable Cup, 473 ml YETI · YETI |
8.2 | 4.4 ★ | 603 | 473 ml · stackable | Stainless steel | £28.00 | Amazon › |
| 09. Chilly's Original Bottle, 750 ml Matte Top rated Chilly's · Chilly's |
9.5 | 4.7 ★ | 16,126 | 750 ml · no sweat | Stainless steel | £29.00 | Amazon › |
| 10. Contigo Streeterville Desk Mug, 420 ml Contigo · Contigo |
8.4 | 4.3 ★ | 2,700 | 420 ml · desk mug | Stainless steel | £11.66 | Amazon › |
Only three of these ten are bottles you can seal and drop into a rucksack. The rest are travel mugs, an open wine tumbler, a stackable cup and a five-litre pump pot for a table. Settle that question before you compare capacities or prices.
Both YETI listings say in the title that the MagSlider lid is not leakproof, and they are not the only ones in this category. If the flask travels in a bag rather than a cup holder, look for the words leak proof, autoseal or screw cap, and treat a magnetic slider as a splash guard.
Only one title in this top ten quotes a figure at all: the Contigo states up to five hours warm. Everything else says vacuum insulated and stops there, so treat an unstated hold time as unknown rather than assuming the dearer flask keeps heat longer.
The spread runs from a 295 ml tumbler to a 5 litre air pot. Something in the 470 to 500 ml range fits a car cup holder and a rucksack side pocket; a 1,180 ml bottle is a day on a hill and it is heavy before you fill it.
A wide mouth takes ice cubes and a bottle brush; a narrow drinking spout is pleasant to drink from and hard to reach into. The Hydro Flask is the wide-mouth option here, and the Blockhütte ships with a cleaning brush, which tells you how narrow it is.
A working double wall keeps the outside dry, which is what Chilly's sells as no sweat, and a powder coat adds grip on top of it. A flask that leaves a ring on the desk is telling you something about the vacuum, not about the drink.
A vacuum flask has two steel walls with the air drawn out between them, which is what keeps a drink hot or cold; everything on this page works that way. A hip flask is a single-walled spirits carrier sold as barware, with no insulation at all. The words are close, the products are not.
The YETI MagSlider is a magnetic slider rather than a seal, and YETI writes that into the listing title. It is fine on a desk or in a cup holder and wrong in a bag. It is also a good argument for reading the title before the star rating.
The Contigo West Loop is a cross-border listing that kept its German product text on the UK store. It is the same mug and it carries the largest review count on this page, but the five-hour claim, and everything else worth reading, is in German.
The products are ordered by estimated monthly revenue per ASIN, not by star rating and not by bestseller rank. Only listings with at least 200 reviews and an average of 4.3 stars were included. Revenue mixes price and volume, which is how a £46.62 bottle and an £8.52 mug end up three places apart.
The score is not our own hands-on test. It is calculated transparently from public Amazon data: 75% from the average star rating and 25% from the number of reviews, weighted logarithmically. The ranking order itself comes from estimated monthly revenue per ASIN. Prices, ratings and review counts were retrieved from Amazon.co.uk on 22 July 2026 and can change at any time.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. All links are affiliate links. Prices are snapshots taken on 22 July 2026; the current price is shown live on Amazon. Product images and details come from Amazon or the manufacturers.