LEAK PROOF RUBBER BOTTLE: The large bag has molded, leak-proof opening for easy filling with hot water and seamless rubber bottle which has embossed surface and complete with stopper. QUICK PAIN RELIEF & HOT THERAPY - Remedy for sore muscles, stress or cramps, arthritis, aches and pains, stiff necks, lower back pain and sports injuries. SAFE & CONVENIENT: Made of high quality natural rubber that retains heat or helps maintain liquid temperature for an extra long time and to make skin contact safe and comfortable. IDEAL FOR: Effective treating sore muscles, women menstrual cramps, medical purposes, during pregnancy or as a feet warmer, stress or arthritis & other common aches perfect birthday or holiday gift to your parents, family and friends. Read Less