3 Compartment vape case for the SMOK Stick Prince Baby. This case has one main compartment for you vape and an extra compartment for an extra tank. This case features a locking mechanism. You have a main body part that contains your sliding rod, your main compartment, and your extra 2 compartments.screw in the unscrew the top screw from the sliding rod to release your cap then screw in your larger screw on the front to unhing the first the compartment from the second, then screw in the screw to connect the first compartment with the sliding rod. Slide the rod up and you have access to the second compartment. Repeat those steps to get access to your main compartment.