LePresso 320ml Insulated French Press Coffee Mug – Leak-Proof, Dual-Layer Stainless Steel Travel Mug with Secure Locking Lid Leak-Proof Design: Prevent spills with a secure locking system, ideal for travel and daily use. Dual-Layer Stainless Steel: Keeps beverages hot for up to 8 hours and cold for up to 12 hours. 320ml Capacity: Perfect for brewing and enjoying a single serving of coffee or tea. Built-In French Press: Brew coffee or tea directly in the mug with the integrated French press and distinctive filter system for the best flavor. Heat Retention: Dual-layer construction ensures excellent insulation for both hot and cold drinks. Travel-Friendly: Compact, lightweight, and designed for convenience on the go.