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Thermos Flasks

Whether you want to pack a lunch for the day or refuse a single-use plastic coffee cup, thermos flasks are your best friend when you’re on the go. Vacuum flasks are leak-proof, compact and insulated to keep your food and drink hot or cold for several hours. Read on for our tips on using food or drink flasks and selecting the best thermos for you.

How do thermos flasks work?


When you pour a hot drink into a cup or mug, after a few minutes it has gone cold. This is because heat escapes by convection and radiation into the surrounding air, and also travels by conduction into the surfaces that the mug is touching.

A thermos flask, also known as a vacuum flask, combats all three of these escape channels. Conduction is prevented by vacuum insulation, which is sealed within a double wall of glass or stainless steel. Convection is stopped by a tight lid or stopper. Heat radiation is prevented by the reflective lining inside the drinking flask, which causes heat rays to bounce back.

This method not only works for hot drinks but also cold drinks. Water bottles that are insulated will keep liquids cold for hours, even during the summer.

How do I clean a thermos flask?


Most thermos flasks are not dishwasher safe. Wash them by hand with washing-up liquid and warm water. Make sure the interior of the flask is completely dry and leave the stopper off before storing.

Which thermos flask is the best?


Although most thermos flasks use the same basic technology, many have extra features that make them more suitable for specific purposes. Below are some common types of food and drink flasks and what their strengths are, to help you find the best thermos for you.

Thermos food flask


Food flasks are wider than drinks flasks for the simple reason of making it easier to spoon food into or out of them. Large thermos flasks for food will often have capacities well over one litre. There are many types of thermos food flask to make meals on the go more convenient:

  • Food flasks with spoons
  • Baby food flasks
  • Food flasks with compartments
  • Thermos flasks with microwavable containers

Drink flask


Drink flasks are usually tall and slim, designed to slot into the side pocket of a rucksack. A smaller 500-millilitre thermos flask will even fit into a handbag, so it’s a perfect size for taking some tea for a stroll in the park with a friend.

Travel mug


Thermos cups are perfect for when you’re travelling. Not only do they keep your drinks hot or cold for a long time, but they are also leak-free. Travel tumblers and reusable coffee cups also help you become more eco-friendly, by avoiding plastic cups. Some travel mugs are made of insulated ceramic and feature stylish or personalised designs, making them a great Christmas present or stocking filler.

Stainless steel flask


Stainless steel flasks are sleek, easy-to-clean and naturally BPA-free. Thermos flasks with steel walls are also unbreakable since they do not have vacuum insulation with glass walls.

Where can I buy thermos flasks?


Browse a wide variety of food and drink carriers for day trips and an eco-friendly lifestyle on Houzz UK. There are also plenty of lunch boxes and bags for children and adults.
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