Invented in 1913, William Stanley ensured this flask was built to last and with its double wall stainless steel insulation would keep liquids to the desired temperature for numerous hours. This 470ml Classic Green flask can keep drinks warm or cold for a full 15 hours meaning you will always have a tasty drink to hand. It will even keep drinks ice cold for 60 hours. The insulated lid doubles as a cup so you can sit and pour a drink any where. Due to its light weight and durability it is ideal for construction site workers. It is also leak proof. This product has a Lifetime Warranty.