Mighty Mug Unspillable Travel Mug 320ml 1 "Disappointing" Mrs Gawthorp 30 December 2017 I bought this to replace a Lakeland thermal flask that you no longer seem to do and I have to say I am highly disappointed. Yes it is very clever that it doesn't fall over when knocked but when it isn't upright, in a bag for example, it leaks and the tea was cold within 2hrs of being made. A note from the team Thank you for placing your review. I'm sorry to hear it didn't suit. The Mighty mug is designed as a single serve travel mug and will keep drinks warm for 30-40 minutes. The lid is leak proof if accidentally knocked over but we wouldn't recommend putting it in a bag when travelling. It sounds like a flask would be more suitable and I can recommend the Lakeland thermal flask, reference 72435 or the Tumbler flask, reference 71801.