The Transit collection with AeroLight technology is designed to be lightweight, space-saving, and leak-proof – perfect for both hiking and your daily commute. Our commuter-friendly Transit mugs are 33% lighter than Stanley's standard stainless steel mugs. The collection utilizes Stanley's AeroLight technology, which consists of spun stainless steel and double-wall vacuum insulation to reduce weight – without compromising on heat or cold resistance or durability. These completely leak-proof mugs feature a sleek design and a flat lid, making them compact and easy to carry. They also fit comfortably in car cup holders.