It’s a double-walled, vacuum-insulated cup made from food-grade stainless steel and designed to last a lifetime. The mug comes with a matte black charging coaster, which we keep on our desks because the battery life does not last beyond those three hours.

Another consideration is the insulation and thickness of the bottle cap in comparison to our sipper lid, and voila! But this cup is equally good all year round because it keeps hot drinks warm for up to 12 hours, and the insulation keeps the outer bottle cool enough to handle safely. Made from durable, lightweight plastic, it's easy to carry and fits comfortably in your hand and cupholders.

Smart tech makes almost every area of our lives that little bit easier nowadays, including on-the-go drinking with the Ember mug². As with all the brand’s cups, the lid pushes on for a secure fit, and there is a smooth opening from which to drink that can be closed with the swivel stopper. The rest are sent to landfill, generating 152,000 tonnes of carbon dioxide a year – equivalent to the emissions of 33,300 cars. And because you’ll be needing plenty of hydration after a workout, it accommodates for a generous 500ml of liquid. We found the hinged mouthpiece cover a little tricky to open when we first started testing, but it became easier with each use.

Temperature duration depends on a few things like volume, drinking hole diametre, lid insulation, and even room temperature during testing. There’s a detachable stopper in the lid to prevent your drink from sloshing around, and it has a stylish dark navy colouring that stands out nicely. If all your fitness gear has to be matching, you might as well include your refillable drinks bottle in that too.Our tip for the parents out there: this size makes for an excellent babyccino to keep the little one happy while you enjoy a real coffee. This one from Lululemon is designed for both hot and cold drinks, allowing you to use it for both throughout the day. When locked, the lid creates a perfect seal and despite our best efforts, which included tipping it upside down and shaking it, we were unable to elicit any liquid out of its confines. Having only a dinky bag is no excuse for not carrying a reusable coffee cup because Stojo’s design collapses down to a couple of inches high for easy storage on the go. KeepCup was conceived as an easy to use product that replicates the functionality of a disposable cup.