multifunctional hot water injection bag hand warmer belly warmer heating pad suitable for female students daily use

2026 new hot water bag, made of thickened explosion-proof material with safety certification, providing lasting heat retention for 12 hours. Smart temperature control to eliminate the risk of burns. Soft skin-friendly fabric for comfort. Portable design that warms hands and stomach, helping relieve menstrual pain. Whether at work or at home, one bag solves all worries. Authorized testing ensures quality assurance, adding warmth to your winter season.