A bottle carrying handle is needed
for convenient and safe transportation of heavy 19-liter (and other sizes) water bottles. It attaches to the neck of the bottle, making it easy to lift and carry, which facilitates installation in coolers, transportation, and household use.
Main purposes and advantages:

    Comfort: Turns a heavy bottle into an easy-to-carry load, reducing the strain on your arms and back.
    Safety: Prevents the bottle from falling, especially when installing it in a cooler or transporting it in a car, both for courier services and at home.
    Versatility: Many models have side hooks for carrying 5-10 liter bottles at the same time, allowing you to carry several bottles at once.
    Ease of use: Fits over the neck and locks into place when lifted, holding securely.
    Durability: Made of durable plastic that is resistant to stress. 

Thus, it is a simple but very practical device that greatly simplifies the handling of large water bottles.