The GoCup is made from FDA food-grade silicone, for a collapsing travel cup that is 100% leakproof. A press-fit lid keeps things clean during transport and the medium size (8 fl.oz.) features the integrated DoubleDecker storage container. Snap it into the lid and the DoubleDecker provides 2 separate compartments for organizing pills. Bring it on the go or on your next camping/backpacking trip. The civilized, collapsing cup + Telescoping for compact storage + Includes integrated pill holder in the lid + FDA food-grade silicone + BPA-free, PC-free, and Phthalate-free Small (4 fl.oz./118ml). Medium (8 fl.oz./237ml)