Longfill E-Liquid UK | 20ml in 60ml Bottles

Longfill E-Liquid

A longfill is a 20ml bottle of flavour concentrate sitting inside a larger 60ml bottle. The empty space is there for you to top up with unflavoured VG/PG base, and a nic shot if you want one, so you mix the strength and ratio yourself. It is a flexible, lower-cost way to vape, and it is about to get a lot more relevant with the 2026 vape tax.

Just Juice longfills are the biggest range we carry, across fruit, menthol and tobacco, with Chubby and other brands rotating through. Every bottle is a 20ml concentrate ready to top up with your own mix. If you would rather grab something ready to vape, our shortfills and nic salts are in stock too. The sections below explain how longfills work, how to mix one, and why they could be the smart buy after October.

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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.

Frequently Asked Questions

A longfill is a bottle of concentrated flavour in an oversized bottle, usually 20ml of concentrate in a 60ml bottle. You top it up with unflavoured VG/PG base and add a nic shot if you want nicotine, then shake and steep. You buy the flavour and add the cheap base yourself, so a full bottle works out much cheaper than buying it ready-mixed.

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 gives roughly 3mg or 6mg in the finished bottle. Cap it, shake well, and let it steep for a day or two so the flavour settles, a little longer for dessert blends.

Usually yes. With a longfill you pay for the flavour concentrate and add the cheap unflavoured base yourself, so a finished bottle costs less than the same volume bought ready-mixed as a shortfill. The gap widens after the 2026 vape tax, because the duty lands on the concentrate but not on the unflavoured base you add.

They should be. From October 2026 the duty is charged per 10ml of e-liquid, and it applies to the flavour concentrate and nic shots but not to the unflavoured VG/PG base, which has no nicotine or flavouring. Because a longfill is mostly base you add yourself, you only pay duty on the small concentrate, not the whole finished bottle.

Yes. Instead of a freebase nic shot, add a salt nicotine shot to your longfill for a smoother throat hit at higher strengths, which suits MTL pod kits. The mixing is the same: top the concentrate up to the line with base, add your salt shots, then shake and steep.