This novelty collapsible cup made of stainless steel comes with key ring and has a capacity of 8 oz. The retractable lightweight design and pocket size saves space and easy to carry, suitable for drinking or brushing teeth on the trip and never leakage and tarnish proof. It comes with a lobster clip for easy carry, can be attached on your belt loop, backpack or other places, ideal for camping, trip, picnic and so on. 2.5 oz and 4.8 oz also can be provided.