Ultra-Portable Pod Systems are the smallest full Pod Devices available and offer an excellent balance of size and functionality. These pocket-sized, pod mods or vape pods are great vaporizers and vapor systems. A pod system or pod kit is an all-in-one starter kit for vapors who want to vape salt nicotine. These are naturally smaller than the typical box mod, produce a lower wattage, and are made for salt nicotine juices. (However, most pod devices can vape regular nicotine juices). Best Pod systems usually have replacement pods that are either refillable or disposable. Most devices are rechargeable and do not rely on an external battery. The differences between an open system and a closed system. The difference between an open system vape and a closed system. A vape is simply describing whether or not you can choose your juice. Open systems allow the user to pour in juice, whether it’s in a tank, a rebuildable atomizer, or a pod. A closed system comes with juice pre-filled in. This means that the pod vaping devices are disposable and are meant for one-time use only. Closed systems are meant for MTL puffs (mouth to lungs) because they contain more nicotine. Think of closed systems as a true e-cigarette, as saltnic more closely replicates the feel of traditional e-cigarettes.