The RELX Pod Pro 2 is the newer pre-filled cartridge for RELX devices, and the headline here is leak protection. Each pod is built with eleven structural layers to keep e-liquid contained, which is aimed squarely at the leaks that can frustrate pod users. They come three to a pack, each holding 1.9 mL of e-liquid at 20 mg/mL salt nicotine and good for around 500 puffs, so the pack covers roughly 1,500. They fit the RELX Essential and Infinity devices, and as a closed system there's nothing to refill or clean: click in a pod, vape it, replace it. RELX keeps a broad flavour range across fruit and classic blends. If you've had trouble with pods leaking, or you just want a three-pack to stock up, the Pro 2 is the option to look at.