PRIME FLASK , a high-quality 420ml double-wall flask designed for durability and functionality. Constructed with a 316 stainless steel interior and a robust 304 stainless steel exterior, this flask ensures long-lasting performance while maintaining the purity of your beverages. Featuring advanced vacuum insulation, the PRIME FLASK keeps drinks hot or cold for hours, making it perfect for daily use, travel, office, or outdoor activities. The food-grade silicone ring guarantees a secure, leak-proof seal, preventing spills and enhancing portability. Its compact size of 16.8 x 7.8 cm diameter fits comfortably in hand, bags, and cup holders. Packaged in an eco-friendly paper box, this flask is an ideal gift choice for those who appreciate premium quality combined with practical design. Key Features High-Quality Stainless Steel:  316 interior for purity, 304 exterior for durability Vacuum Insulation:  Maintains beverage temperature for hours, hot or cold Leak-Proof Seal:  Food-grade silicone ring ensures secure closure without spills 420ml Capacity:  Convenient size for hydration on the go Compact & Portable:  Fits easily in hand, bags, and cup holders Eco-Friendly Packaging:  Packaged in recyclable paper box, great for gifting Product Specifications Specification Details Product Name PRIME FLASK Capacity 420 ml Dimensions 16.8 x 7.8 cm (Diameter) Inner Material 316 Stainless Steel Outer Material 304 Stainless Steel Insulation Vacuum insulated Seal Food-grade silicone ring (leak-proof) Use Case Hot & cold beverage retention Packaging Paper box Best For Business Teams (Team Gifts, Onboarding Gifts, Best Achievers Gifts, Outing Team Gifts, Anniversary Gifts, Junior Team, Senior Team, Top-Level Team) Event Organizers (Exhibitions, Tradeshows, National Events, Online Events) Promotions & PR Campaigns Travelers and Outdoor Enthusiasts Clients and Corporate Gifting Office Workers and Freelancers Employees at All Levels Outing and Team Building Events