1.The collapsible travel cup is made of food grades silicone, no small, non-stick and keep your health. 2.Space saving and only 2.5 inch when collapsed, fits well in your pocket, purse, backpack, suitcase and takes up no space, ideal for outdoor hiking, camping, travel, and sport events. Also perfect using in office as coffee cup. 3.Safe & Leak-proof uniquely designed airtight silicone seal effectively prevents leaks. 4.Our portable travel folding silicone coffee cup comes with D shape hiking hook. It is easy to be hung on the bag of a connective hand rope and portable hook. 5.Capacity & thermostability - Max 550ml volume capacity, withstands the temperature range is -58F ~ 392F. 3 adjustable sizes to meet everyone& 39;s needs.