The collapsible travel cup made of food grades silicone, guaranteed silicone lid, BPA Free. Easy to wash, odorless, non-staining, durable, flexible & reusable. Update the collapsible design, space-saving when collapsed, fits well in your pocket, purse, backpack, suitcase and takes up no space, ideal for outdoor hiking, camping, travel, and sports events. Can be hung on the bag – Tight fitting the lid prevents any dust and dirt to get close. The small collapsible volume and lightweight made them both of these use for home and outdoors.