Boulder Rock Replacement Pod/Module

My current favorite. They have a few quirks, but overall they are the best. There is a technique to filling them with your favorite e-liquid. The spout doesn't fit into the fill hole, but that's okay. Fill it slowly and there's no issue. It's better than using something wit a tip that fits inside. If anything other than liquid touches the wick, it'll likely leak. You definitely don't want to fill over the level in the instructions. Be careful with the stopper so you don't drop/lose it. It can be hard to spot if you have to look for it. I wipe them down with a cleaning agent with every refill. Used properly, they are long-lasting, have an excellent hit, don't leak and no liquid in mouth!