Travel mug LEAK PROOF! Amazon £16

Stanley lockable leak proof travel mug capable of holding 16oz or 473ml this item was bought from Amazon for a price of roughly £16 deliver next day on Amazon prime. Well made mug made by a company call Stanley who also make a wide range of other items.
The item itself is vacuum sealed full stainless steel apart from the lid which is plastic based with a locking design along with rubber seals to prevent leaks.