Made out of Food Grade Material, Sanitary, Drinkware Superior Material for Safe and Health Drinking: made of food grade silicone, non-toxic, anti-staining, flexible, portable, reusable and unbreakable Folding/Collapsible Design to Easy Storage: easy to carry, convenient to store; can be kept in bag, hanged on the bag or taken by hands. Easy to Unfold the Cup: unfold the silicone cup and get beverage easily. Ideal for outdoor hiking, camping, travel and sports.