Compact and portable: This foldable travel mug features a unique telescopic design, providing an easy grip when folded. Equipped with a keychain on the rim, it easily attaches to a backpack, saving space while ensuring portability, flexibility, and convenience. Dustproof and leakproof: The lid of this foldable stainless steel cup fits snugly against the cup's body, effectively preventing dust and contaminants from entering while keeping the inside clean. The cup's assembly is impeccable, ensuring an excellent seal, preventing leaks. Material: This foldable travel mug is made of high-quality 304 stainless steel, offering exceptional stability and wear resistance. It is resistant to rust and deterioration, whether used in humid outdoor environments or subjected to frequent cleaning. High-quality finish: This flexible cup benefits from meticulous polishing; its smooth, fluid telescopic sections open and close without ever getting stuck. The rounded, smooth rim ensures optimal comfort when drinking. Versatile: This foldable cup is portable, stylish, and practical. It can be used as an everyday mug, mouthwash cup, coffee mug, etc., making it the perfect accessory for outdoor adventures, travel, business trips, or even as a gift idea.