Abstract: The cup leash is an elastic strap having two ends and a childproof fastener for forming each end into a loop. The leash is designed so that one end is secured to an anchor such as a toddler's seat, a car seat, a stroller, a highchair, or the like, and the other end is looped around a drink container, such as a child's sippy cup. Preferably the childproof fastener is a buckle with a resilient catch that requires more force and manual dexterity to open than a toddler is capable of. The tether limits the distance the drink container can be thrown and permits easy retrieval of the container when it is dropped or thrown by the toddler.