The Electroless Vacuum Insulated Thermal Jar is a stainless steel, power-free vacuum flask designed for long-lasting insulation. It features a dual-compartment structure: a clasp-switch vacuum outer box and a double-layer screw-lid inner box, preventing flavor mixing and enabling easy food storage. Innovations include a shoulder vacuum spot (relocated from the traditional bottom position) to enhance durability and maintain vacuum integrity during frequent use. The user-centric design incorporates a clasp-opening mechanism for effortless access, particularly user-friendly for female users, and a “fuzzy design” inner container that can be placed freely without orientation constraints. A pressure-relief valve on the inner lid ensures smooth opening, while the wide grip space and dead-space-free structure simplify handling and cleaning. By reviving the tradition of homemade meals, this product reduces reliance on disposable packaging, aligning with sustainable development goals.