Vitamix S30 S50 S Series Eastman Tritan Copolyester 20 Ounce To-Go Cup, Set of 2 Made from BPA free Eastman Tritan Copolyester Comes with 2 to-go containers Made to be used with the S-Series Vitamix machines or on its own Ready for blending, storage, and travel Dual wall insulation transports hot and cold blended mixtures