Hot Water Bag

"Material: Rubber, unlike other unreliable water bags, its can resist the hot water pressure comfortably.
High quality guaranteed rubber hot bag, Leak proof, colorful, high quality, Easy to clean & Keep water hot for longer time.
Fill 2/3rd of the bottle and before tightening the stopper expel the excessive air..
Treats muscular pain, induces relaxation, releases stress nstantly relieves joint pains, muscular cramps, menstrual pains, stomach and back aches."