Your questions about reusable coffee cups answered What is the best reusable coffee cup? What makes the best reusable coffee cup will depend on your priorities. However, I think the Circular & Co coffee cup is a great all-rounder, from its leak-proof lid to its considered materials and handy 360-degree sipping experience. It also keeps drinks hot for longer than your average single-use cup. Meanwhile, the Ecoffee cup and Joseph Joseph designs offer brilliant value for money, and Frank Green’s ceramic reusable cup is a clear winner when it comes to keeping drinks hot for longer. Then there’s the Ocean Bottle tumbler , which not only looks very smart but helps the brand’s mission to tackle plastic waste pollution, too. How I tested reusable coffee cups I tested each coffee cup over a number of weeks, assessing them all for the same qualities.…