Plastic bottles bearing the MK logo are permitted. In addition, the following sizes are permitted, even if not bearing the logo: 250g/220ml, 342g/300ml, 460g/400ml, 570g/500ml, 650g/570ml, 700g/605ml, 910g/800ml, 1kg/875ml, 1.35kg/1170ml, 1.5kg/1320ml.