Quality assurance: The hot water bottle is made of high quality natural rubber and plush, seam explosion-proof, foldable, not easily deformed, odorless, not easily deformed, good insulation, leak-proof cap on the bottle neck, removable and washable. Large capacity: The long hot-water bottle holds 2 liters and is 32 x 18.5 cm in size. The wide opening allows easy filling. Fill it to two-thirds of its maximum volume to keep it warm for a long time. Long-lasting warmth: the long thermal bag provides long-lasting warmth; the long heat pad provides long-lasting comfort and warmth for your neck, shoulders, back and abdomen; keep the neck and shoulder tube warmer bag warm overnight in bed or on a blanket and the outer shell will keep you more comfortable in the cold and warm and cozy in winter. Soft Cover: The hot water bag is velvety soft on the skin and the soft, fluffy cover prevents burns from direct skin contact. The long heating pad provides comfortable, long-lasting warmth for your neck, shoulders, back and stomach. Note: Do not fill in too much water, 2/3 is enough.