Take your wine camping, on a picnic, or to a festival. The lightweight, nesting GSI Outdoors Wine Glass Set is super lightweight and nearly indestructible, the GSI Outdoors nesting wine glass goes anywhere with a unique stem design that unscrews. Made of copolyester plastic (BPA free), these nesting wine glasses provide excellent impact resistance and are suitable for both warm and cold beverages. Glasses unscrew at the midpoint of the stems so that the bases can be snapped into the bowls for easy packing and storage. Wine glasses hold 15 fl. oz.