Feature:1. TIGHT SEAMS: Portable hot water bottle with 3D modeling design, no gasket to prevent aging leakage.2. SAFETY MATERIAL: Hot water bag using new PVC environmental protection particles manufacturing, safe and odorless, pregnant women and children feel safe to use.3. ANTI PRESSURE: Hot water bottle using high temperature and high pressure type technology, with a large thread bite, to achieve the function of anti pressure explosion proof.4. APPLICABLE PARTS: PVC hot water bag multi part application, warm hands, warm back, warm neck, warm stomach.5. BOTH HOT AND COLD: Warm water bag hot and cold, suitable for all seasons, winter can be filled with warm water summer can be filled with cold water.Specification:Item Type: Hot Water BagMaterial: PVCProduct Specification: 500MLProduct Size: Approx. 20x12.5cm / 7.9x4.9in.Package List:1 x Hot Water BagNote:All data are measured manually, and there are certain errors in the measurement results.