LONG-ACTING CONSTANT TEMPERATURE HOT WATER BOTTLE FOR WARM EXPERIENCE. When you inject 100° hot water, the surface temperature of the hot water bag is controlled at about 60°, so that it will not burn because of the high temperature. Super White hot water bottle will bring you near 6 hours of warmness, and hold heat for longer than most of its competitors. BEST ASSISTANT FOR PAIN RELIEVERS AND ESSENTIAL HOME REMEDY EFFECTIVELY. The classic design of the hot water bag can treat sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain, menstrual cramps and other common aches and can also double up as a cold compress for kids travel or camping. DOUBLE PROTECTION & ANTI-LEAK DESIGN KEEP YOU AWAY FROM THE RISK OF BURNS. BURNS. The hot water bag features a threaded stopper which twists securely thus preventing leaking. Wide mouth for easy fill, so that you can fill the water bottle more easily. Fill only to two-thirds capacity maximum. Double protection design avoids you scalding injury.