Generally you will find two main different type of pod kits or pod systems to choose from; One is a Closed Pod systems, and the other Open Pod systems. Closed pod system are found to be the easiest device to use in the vaping market, and only use replaceable cartridges to function, which are not refillable, but come pre filled with e liquid. They are in a way extremely convenient when we are looking at ease to use, and you can also carry a spare pod, which can easily be swapped, without having to refill or changing coils on the go. The main downside of this is that you are limited to the flavours a manufacturer produces, and therefore won't be able to use most of what is available in the market. The Open Pod systems on the other hand, while they have disposable pods, you can refill them and use any compatible flavoured e liquid with them. There are also other pod devices or vape pods such as Pod Mods, which are light-weight pod devices, featuring either semi or full sub-ohm capabilities, providing settings customisation and a larger battery power.