If top of the range is important, then check out 500ml Seville Double Wall Mug. 100% BPA free, it features a powder-coated outer (black), pro-grade 18/8 double wall vacuum stainless steel construction, unique copper lining (designed to keep drinks hot or cold for hours) and clear acrylic lid with ultra-glide sliding tab. Available in powder-coated matt black or natural stainless steel. Supplied in a black gift box.