Thermos vacuum insulated mug, 350 ml

For a drink alongside your morning routine or at your desk, the Thermos JDG-353LTD is a compact vacuum-insulated mug with a lid and a 350 ml capacity. Its published heat and cold retention figures cover one hour, so they’re more useful for judging a short stretch of use than expecting all-day temperature control.

The Cool Gray finish and built-in handle give it the feel of a personal everyday mug rather than a large travel flask. What matters more: does its size suit the drink you usually make, and is a lid enough for the way you use it?

How to use it

At 350 ml, this mug is sized for an individual serving. Picture making tea before settling in at your desk: the lid can sit over the drink while you work, but the information provided doesn’t say that it is leakproof, so it shouldn’t be treated as a sealed bottle for tossing into a bag. Its approximate dimensions are 11 x 8 x 10 cm, making those measurements worth comparing with your usual storage spot or cup holder if fit matters.

It makes sense if you want a handled mug with a lid for everyday drinks and are happy with a stated one-hour retention window. If you’re choosing it for a long commute or extended time away from a kitchen, the listed figures don’t establish how well it will perform beyond that hour. It’s not for you if you need confirmed leakproof carrying or longer-duration temperature claims, neither is specified here.

Pros

• A 350 ml capacity suits a single drink without the bulk of a larger flask.
• The lid and handle make it closer to a familiar mug than a lidless cup.
• The stated retention figures give a defined, one-hour reference: above 67°C for heat retention and 8°C or less for cold retention.
• Stainless steel forms the body, with an acrylic resin coating, the handle is ABS resin and the lid is polypropylene.

The main qualification is the time frame. These figures are for one hour, not a promise that a drink will stay at the same temperature throughout a workday. There’s also no supplied information about cleaning, dishwasher use or whether the lid prevents spills, so those details shouldn’t be assumed.

Spec sheet

• Name: Thermos JDG-353LTD CGY Vacuum Insulated Mug
• Type: Mug with lid
• Capacity: 350 ml (11.8 fl oz)
• Colour: Cool Gray
• Dimensions: Approx. 11 x 8 x 10 cm (4.3 x 3.1 x 3.9 in)
• Weight: Approx. 200 g (7.1 oz)
• Material: Stainless steel body with acrylic resin coating, ABS resin handle, polypropylene lid
• Heat retention: Above 67°C (140.6°F) after 1 hour
• Cold retention: 8°C (46.6°F) or less after 1 hour
• Country of origin: China

What I’d decide

Choose this if the 350 ml size works for your usual serving and you want a handled mug with a lid for nearby, everyday use. The one-hour figures are the key buying detail: they offer a clear reference for a short period, but not evidence of all-day insulation. A more basic open mug may suit you just as well if you’ll drink straight away, for carrying drinks in a bag or keeping them hot for much longer, look for a product with explicit leakproof and longer-duration claims. The stated details don’t confirm either for this mug, so I’d base the decision on its capacity, materials and intended place of use.