Design and Details: Collapses flat to less than 2 cm thick fit into your pocket Space-saving cup takes lightweight functionality to a new level Made from BPA-free, food-grade silicone, with nylon rings to maintain shape and shield fingertips from heat Base, rim and center ring made of light-yet-durable glass-reinforced nylon 66 Specs: Depth: 3.5" Dimensions: 4.0" x 4.0" x 3.5" Volume: 400 ml Weight: 1.9 oz