Thermos invented the vacuum flask. For over a century, the brand has been the benchmark for temperature retention — the name that professionals, adventurers, and commuters reach for when they need a drink to stay hot or cold for the long haul. The Thermos Ultralight Flask takes that heritage and applies it to a new challenge: delivering the same Thermos insulation performance in a bottle that's 48% lighter than comparable insulated flasks.
210g. That's the weight of the Thermos Ultralight 500ml — lighter than most smartphones, lighter than a standard water bottle, lighter than anything else that keeps drinks hot for 12 hours and cold for 24. Unbreakable stainless steel. 100% BPA-free. Leak-proof safety lock. Dishwasher safe. And at £55.93, it's the Thermos quality that serious adventurers and daily commuters have trusted for generations, in the lightest form it's ever taken.
Why Weight Matters in a Flask
For hikers, cyclists, runners, and anyone who carries their kit on their back or in a bag, every gram matters. A standard insulated flask weighs 350–450g — significant when you're already carrying food, clothing, and equipment. The Thermos Ultralight at 210g is the flask that doesn't feel like a compromise — it's light enough to carry without noticing, and it performs with the same temperature retention that Thermos has delivered for over a century. The innovative manufacturing process that achieves this weight reduction doesn't sacrifice insulation performance — 12 hours hot, 24 hours cold, in a bottle that weighs less than a can of drink.
Usage Cases & Real Situations
🥾 The Hiking & Trail Running Pack
For hikers and trail runners where pack weight is a constant consideration, the Thermos Ultralight is the flask that makes the cut. At 210g, it adds less weight than most energy gels and snacks combined, and the 12-hour hot retention means a morning coffee stays warm through a full day's hiking. The leak-proof safety lock means it can be packed in any orientation without risk of spillage, and the unbreakable stainless steel handles the drops and knocks of trail use without damage.
🚴 The Cycling Companion
Cyclists need hydration that's accessible, lightweight, and temperature-controlled — cold water on a hot day, hot coffee on a cold morning. The Thermos Ultralight's 210g weight makes it the practical choice for a jersey pocket or a small saddle bag, and the 24-hour cold retention means ice water stays cold through even the longest summer ride. The leak-proof design means no spillage in the pocket or bag.
🚂 The Daily Commuter Flask
For commuters who carry a bag every day, the weight of a flask is a daily consideration. The Thermos Ultralight at 210g is the flask that doesn't add meaningfully to the bag's weight, and the 12-hour hot retention means a morning coffee stays warm through the commute, the morning meetings, and well into the afternoon. The dishwasher-safe construction means cleaning is effortless, and the leak-proof safety lock means it can go in the bag without a second thought.
⚾ The Sports & Outdoor Events
At sports events, outdoor festivals, and long days out, a lightweight flask that keeps drinks at the right temperature is the practical essential that makes the day more comfortable. The Thermos Ultralight's 500ml capacity is the right size for a day's hydration without being bulky, and the 24-hour cold retention means ice water stays cold from morning to evening without needing to find a cold drink vendor.
The Bargain Case: What You'd Pay Elsewhere
Thermos Ultralight flasks from outdoor retailers — Cotswold Outdoor, Blacks, GO Outdoors, or specialist flask retailers — typically retail at £60–£75 for the 500ml Ultralight model. The Thermos brand commands a premium that reflects its century-long reputation for quality and performance. At £55.93, this represents a genuine saving against standard outdoor retailer pricing for the same Thermos Ultralight product — the same 210g weight, the same 12-hour hot/24-hour cold performance, the same leak-proof safety lock, and the same dishwasher-safe stainless steel construction.
In Stock — The Lightest Flask That Doesn't Compromise
The Thermos Ultralight Flask 500ml is the flask for people who take their kit seriously — the one that delivers Thermos performance at a weight that makes it genuinely practical for every adventure and every commute. At £55.93, the lightest Thermos ever made is available now.
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