The RUBI is an open-system pod vape perfect for using your own nic salts or any ejuice. It comes with a 1 mL empty pod and a universal micro-USB charger. It’s slightly larger than the JUUL but more ergonomic with rounded edges. It also has a larger e-juice capacity, more airflow, and longer battery life at 280 mAh. And speaking of the battery, Kandypens states that it comes with a lifetime warranty.