Our Pioneer vacuumware ranges are created with function and durability in mind, whilst always keeping an eye out for cool designs and stylish products that everyone will want to use.

Constructed with the finest 18/10 stainless steel, all of our products are guaranteed to keep drinks hot for up to 8 hours and cold for up to 24 hours*.

From sports flasks and travel mugs to soup flasks and lunchboxes, the Pioneer range has items to suit all activities.

How does the structure of a Pioneer vacuum flask keep drinks hot or cold?

Pioneer vacuum flasks are made with a stainless steel double wall and a vacuum inside. There is an inner stainless steel layer, a vacuum and then a reflective stainless steel layer that prevents heat energy from radiating outwards. The flask is then covered with a protective outer casing.

*Smaller flasks may keep temperature for a lesser time due to size.

There are two types of vacuum insulation

A flask can be filled with foam insulation or a vacuum. Many cheaper flasks on the market use foam. The foam does provide insulation, however, flasks made with foam do not give you the same performance or value for money like a vacuum flask does. It may be cheaper, but what it saves you in money does not save you in efficiency! Unlike vacuum flasks, they only keep liquids hot for 1-2 hours.

Pioneer Flasks are always true vacuum flasks

A vacuum flask maintains a vacuum between its two layers in order to minimise heat transfer. A vacuum is a lack of atoms, and so a “perfect vacuum” contains zero atoms. Without atoms to transfer heat from one surface to another, you eliminate conduction and convection completely. The space between the two layers keeps heat from traveling via conduction, and the lack of air prevents convection currents from forming, to carry heat away. Radiation is still possible between the layers, so we coat the inner sides of the vacuum flask with a reflective material to minimize the transfer of heat.

Properly sealed, a Pioneer flask can keep drinks hot for around eight hours*, or keep drinks cold for 24 hours.

*The length of time in which a Pioneer flask keeps drinks hot depends on the size and type of product.


We understand that when it comes to purchasing a flask, you want to know that it’s durable, long-lasting and able to keep your food/drink at the optimum temperature through different activities and for many years. This is the reason behind our guarantee. We know that each individual product will outlast this timescale and, if it doesn’t, we’ll exchange it for a new one. It’s a win-win situation.

Our Guarantee to you:

  • Drinks stay hot for up to 8 hours
  • Drinks stay cold for 24 hours
  • Leak-proof
  • Unbreakable when dropped from a distance of up to 4ft

We would like to thank you for buying a genuine Pioneer product. Be assured that you have bought a quality product which is long lasting and durable.