CONSTRUCTION: Best in class Thermo 3D double wall vacuum insulation eliminates condensation and keeps hot stuff hot & cold stuff cold. Hardshell powder coating on colored growlers adds grip and protects & preserves your product's appearance MATERIALS: High quality 18/8 medical grade stainless steel is safe & strong and won't transfer flavor or leave a metallic aftertaste. All MiiR products are guaranteed to be 100% BPA free. Hand wash recommended for long-term product satisfaction LID: Pressure locking clasp prevents spilling or leaking and seals in carbonation to keep contents crisp until you're ready to crack it open SIZE: Holds 64oz (4 pints) of your favorite beverage PRODUCT TO PROJECT: Every MiiR product sold helps fund trackable giving projects. Register your Give Code to experience the story behind your purchase. All MiiR products come with a limited lifetime warranty against manufacturer defects