Boston Red Sox Mason Glass Jar with Lid. These Mason Jars are perfect for enjoying your favorite beverage! These Mason Jars combine turn-of-the-century American culinary culture with contemporary applications and feature a wide-mouth opening, a glass handle, and a tin screw-on cap! These 20 oz. glass mason jars provide a wonderfully nostalgic way to enjoy your beverages or store your food, spices, or pantry condiments. Everything for the Sports Addict!