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 Bag Material: PVC Product Specification: 500ML Product Size: Approx. 20x12.5cm / 7.9x4.9in. Package List: 1 x Hot Water Bag Note: All data are measured manually, and there are certain errors in the measurement results.