The Sea To Summit Passage Cup is a lightweight compact and stackable mug designed for outdoor adventures. Made of durable glass-reinforced polypropylene it features Cool Grip walls that allow you to hold the cup securely even when filled with hot beverages. The silicone sipping lid conveniently folds inside to save space during transport. With a molded volume scale inside and microwave and dishwasher-safe construction this versatile mug is perfect for camping hiking and travel.