CLASS IT UP ON THE HIKE. This lightweight, nesting wine glass goes anywhere with its unique stem design that unscrews and allows the base to be compactly snapped into the bowl for storage. Super lightweight and nearly indestructible, the BPA Free copolyester material will serve you for many more summits to come.FEATURES Made of copolyester plastic, the nesting wineglass provides excellent impact resistance and is suitable for both warm and cold beverages. Copolyester is BPA free. Glass unscrews at the midpoint of the stem so that the base can be snapped into the bowl for easy packing and storage.