The Sea to Summit X-Mug is constructed from a flexible, European standard compliant, food grade silicone. A rigid ring within the rim keeps it sturdy to hold onto and easy to drink out of but still allows the mug to be collapsed to a disk that will fit in the palm of your hand. The X Mug fits neatly into the X Bowl and X Plate and altogether the collapsed set is less than an inch thick. Folds flat for compact packing, Food grade flexible silicone sides, Nylon ring at the top maintains shape and prevents scalded finger tips, 2 cup capacity, Nests into the flat X Bowl and X Plate, Assorted colors, Dishwasher and microwave safe, Category: Cups, Use: Both Backpacking and Car Camping, Weight: 2.4oz, Dimensions: 4.25 x 2.75 (collapses to 0.5) inches, Material: Food grade silicone, Collapsible: Yes, Model Year: 2018, Product ID: 267167, Model Number: 104-