Terra Lusa Thermal Bottle Collection In a true celebration of love and passion, the "sweetheart handkerchiefs" or "request handkerchiefs" were traditionally used in the Minho region to win over a boyfriend. These handkerchiefs carry loving feelings, revealed through various love symbols such as fidelity, dedication, and friendship. This bottle has a capacity of 500ml, keeping your drink hot for up to 12 hours or cold for up to 24 hours. Made from 304 food-grade stainless steel, they feature double-wall insulation for maximum temperature retention and an outer layer resistant to condensation, keeping your hands and bag always dry. Additionally, they are BPA-free, ensuring safe and conscious hydration.