Inspired by Taiwan’s bubble tea culture, the iN Z tumbler enhances the experience of carrying and drinking beverages through its patented sliding unlock mechanism, dual-stage pressure release system, uniquely contoured inner surface, and retractable straw design. The seamless inner wall is formed in a single piece with no weld lines, and the entire cup can be fully disassembled for cleaning or part replacement, offering a balance of usibility, safety, and environmental sustainability.