The capacity of this water cup is 6.76oz. This foldable water cup is made of food grade TPU material for superior durability and flexibility. So it is safe enough that you should not worry about its material. Foldable water cup of us is soft and foldable, which can save space effectively and be placed in any backpack pocket without leaving creases. Easy to crush up nicely into a pocket, and back into shape instantly to fill with water. It is convenient to carry it because of its light weight when you want to go outdoor, exercise or do some sports. Contact us now for details. Can be order under MOQ. Qty more than 3,0000pcs are ship via sea.