What makes the KeepCup cream unique? KeepCup is an Australian brand of eco-friendly mugs that have picked up lots of awards. It all started in 1998 when the Forsyth siblings opened a chain of BlueBag stores selling fresh sandwiches, salads and also coffee to go. But they didn't like the heavy use of materials and unnecessary pollution. And so the idea was born to produce high-quality mugs in a pleasant design that could be used over and over again. Features of the keepcup thermo mug "Keep Cups" are eco-friendly, non-toxic, replace disposable plastic cups and keep coffee and tea up to 30 minutes hotter than in a normal mug. And they are 100% recyclable. This type of Keep Cup is made of soda-potassium glass, which is highly durable. They are also microwave and dishwasher safe. Their minimum four-year lifespan is another good argument for having a KeepCup and saving the environment. They are lightweight with 90% leak-proof. They will start to leak when turned directly.