In the UK nicotine containing e-liquid cannot be sold in bottles larger than 10 ml, but sometimes it can be quite inconvenient to have to carry lots of small e-liquid bottles to make sure you don’t run out. short fills are a way that you can purchase e-liquid in larger bottles to make it easier and cheaper to stock up on your favourites.
Due to the regulations, short fill e-liquid are sold with a nicotine free formula, but are so called because they leave room for the addition of enough nicotine shots to create a 3 mg/ml e-liquid if required.