The cover of the vacuum series is gentle and smooth, inspired by the round smooth shape of pebbles in nature. The gentle and soft edge of the cover is easy to open with its ergonomic design. The bottle lip also fits the human lips to drink with ergonomic design. With the one-touch retractable design, the one-hand opening is easy and convenient. The design of the fastener prevents leaks. The finger hanging ring is pretty and convenient to carry around comfortably.