This anti-spill mug won’t fall over if you bump into it. Grips to any smooth, flat, solid surface, yet lift’s up easily. Idea gift for anyone who works around laptops and computers. Perfect gift for the slightly accident-prone. Hold’s 540ML BPA Free Car Cupholder Friendly Top Rack Dishwasher Safe Plastic mug so very lightweight and easy to carry. Our own ‘office tests’ found this mug keeps a tea/coffee drink nice and hot or around 1 hour 30 mins, which gave us plenty of time to enjoy our drinks warm.