What Is a Longfill E-Liquid?
A longfill is a concentrated flavour in an oversized bottle, usually 20ml of concentrate in a 60ml bottle. You top the bottle up to the line with unflavoured VG/PG base and add a nic shot if you want nicotine, then shake and let it steep. It is sometimes called shake and vape. Because you are buying the flavour and adding the cheap base yourself, you end up with a full 60ml bottle for far less than buying it ready-mixed.
How to Mix a Longfill
Mixing is simple. Take the 20ml longfill, fill the rest of the 60ml bottle with VG/PG base, and add one or two 18mg nic shots if you want nicotine, which lands you around 3mg or 6mg in the finished bottle. Pop the cap on, shake it well, and give it time to steep so the flavour settles, usually a day or two for fruits and longer for desserts. If you prefer salt nicotine, use salt nic shots instead and the same maths applies.
Longfill Brands and Sizes
The standard format here is 20ml of concentrate in a 60ml bottle. Just Juice is the biggest longfill range we stock, covering fruit, menthol and tobacco profiles, with Chubby and other brands rotating through the collection. If you already vape a brand as a shortfill, there is a good chance the same flavours appear here in longfill form, ready for you to mix at home.
Longfills and the 2026 Vape Tax
From 1 October 2026 the new Vaping Products Duty adds £2.20 of duty per 10ml of e-liquid, around £2.64 once VAT is on top, charged by volume whether the liquid has nicotine or not. This is where longfills change the maths. The duty falls on the flavour concentrate and on any nicotine shots, but the unflavoured VG/PG base you add yourself has no nicotine and no flavouring, so it is not classed as vaping liquid and does not carry the duty.
In practice that means a longfill only pays duty on the small concentrate, not the whole finished bottle. Top a 20ml concentrate up to 60ml with your own base and you have paid duty on 20ml of liquid instead of 60ml, which is why longfills are set to become one of the cheapest ways to keep vaping your favourite brands after the change. Our longfill guide runs through the mixing and the savings in full.
It is also worth stocking up before October. Stock made before the duty starts can still be sold through a six-month window to 1 April 2027, and e-liquid keeps for a long time stored somewhere cool and dark, so buying ahead now lets you lock in today's prices before they rise. Our 2026 vape tax guide explains the timeline and what is changing.
