The lids of plastic bottled water are designed to be easier to open, but the "easy" experience is designed for people with normal physical fitness and strong fingers and wrists. If it is the elderly, children, the disabled, and patients with relatively weak physical conditions, it may not be so easy to open them.
Therefore, the oval bottle cap is designed for these vulnerable groups, so that the hand can easily unscrew the bottle cap by grasping the force of the knob, and the detailed design of the shape and anti-slip pattern reflects the care for the vulnerable groups.