The Classic Vacuum Camp Mug is vacuum insulated to keep your beverage hot up to 2 1/2hr. or cold for up to 4 1/2hr. and iced for up to 20hr. Made with 18/8 stainless steel, it wont rust, making it ideal for marine environments. Its naturally BPA-free. It has a leak-resistant flip lid. The integrated D-ring makes it easy to clip onto packs. Dishwasher-safe. Lifetime warranty. Features:Vacuum insulated to keep your beverage hot up to 2 1/2hr. or cold for up to 4 1/2hr. and iced for up to 20hr18/8 stainless steel materials prevents rustingBPA-freeLeak-resistant flip lidIntegrated D-ringDishwasher-safeLifetime warrantySpecifications:Capacity: 16oz.Dimensions: 5.5"L x 3.8"W x 6.1"HMaterials: 18/8 stainless steelWeight: 1lb.