What Is a Vape Shortfill? UK E-Liquid Guide
A 100ml bottle that is not filled to the top is not a packaging mistake. It is usually a shortfill - one of the most practical formats for adult vapers who use refillable kits and want more choice over nicotine strength. So, what is a vape shortfill? It is a larger bottle of nicotine-free e-liquid, deliberately left with enough room for the user to add nicotine shots if they choose.
For retailers, shortfills remain a valuable category because they pair well with refillable pod kits, tanks and advanced devices. They also give regular customers more liquid for their money than buying several smaller bottles. The key is stocking the right bottle sizes, flavour profiles, VG/PG ratios and compatible nicotine shots, then making the choice easy to understand at the counter.
What Is a Vape Shortfill and Why Is It Not Full?
A vape shortfill is usually sold in a bottle with more capacity than the amount of e-liquid inside it. A common example is 50ml of nicotine-free e-liquid in a 60ml bottle. The remaining 10ml space is designed for a nicotine shot.
Another popular format is 100ml of e-liquid in a 120ml bottle, leaving room for two 10ml shots. The e-liquid itself is often labelled as 0mg nicotine before any shot is added. This gives adult users flexibility: they can vape it nicotine-free, or add shots to create a lower-strength nicotine e-liquid at home.
The format became especially familiar in the UK because nicotine-containing e-liquids are commonly supplied in smaller bottles, while nicotine-free shortfills can be offered in larger sizes. For customers, that means less packaging, fewer repeat purchases and a broad range of high-volume flavours. For a convenience or vape retailer, it creates a natural basket: shortfill, nicotine shots and a suitable refillable device.
How Nicotine Shots Change the Strength
Nicotine shots are small, unflavoured bottles of nicotine e-liquid, usually 10ml. They are poured into the shortfill bottle, then the bottle is securely closed and shaken until the liquid is fully mixed.
The final nicotine strength depends on three things: the amount of shortfill liquid, the bottle’s spare capacity and the strength of the nicotine shot. A standard 50ml shortfill with one 10ml 18mg or 20mg nicotine shot will usually produce 60ml of e-liquid at around 3mg nicotine strength. A 100ml shortfill with two shots in a 120ml bottle generally reaches the same result.
This is why 3mg is one of the most common outcomes for shortfill users. It suits many adults using higher-powered refillable kits, sub-ohm tanks and coils that produce more vapour per puff. It will not suit everyone, though. Someone moving from cigarettes or using a low-powered mouth-to-lung pod kit may prefer a higher nicotine strength, often found in nic salts or traditional 10ml e-liquids rather than a standard shortfill setup.
Retail staff should avoid treating nicotine shots as a one-size-fits-all add-on. Ask what device the customer uses, whether they currently vape nicotine, and what strength they are used to. A straightforward recommendation can prevent an unsuitable purchase and build repeat business.
Can You Add More Than the Bottle Allows?
Only if there is sufficient space, and that is where it gets inconvenient. Adding more liquid than the bottle capacity can cause spills and makes accurate mixing harder. Some users transfer liquid into a larger empty bottle, but this is not always the easiest route for a customer who simply wants a quick refill.
It is also worth remembering that adding more shots changes more than nicotine strength. It slightly dilutes the flavour concentration and can alter the final VG/PG balance. One shot in a 50ml shortfill is what most products are designed around. Customers seeking a stronger vape may be better served by another e-liquid format and a device that matches it.
Shortfills, Nic Salts and 10ml E-Liquids Compared
Shortfills are not automatically better than other e-liquids. They are built for a particular kind of vaper and kit.
Shortfills are commonly available in higher-VG blends, such as 70VG/30PG. Thicker liquid is well suited to sub-ohm tanks, more powerful coil setups and direct-to-lung vaping, where flavour and vapour production are priorities. These bottles are often a strong choice for established vapers who get through e-liquid quickly and know the type of flavour they enjoy.
Nic salts are generally sold in 10ml bottles and come in higher nicotine strengths. They are designed for lower-powered pod systems and mouth-to-lung kits, giving a smoother inhale than many traditional freebase nicotine liquids at comparable strengths. They are often the more practical option for an adult smoker switching to a compact pod kit, particularly if they need a stronger nicotine option.
Traditional 10ml freebase e-liquids also remain useful, especially for customers who prefer familiar liquids, lower-wattage kits or a simpler no-mixing purchase. The right product depends on the user’s device, nicotine requirements and vaping style - not just the size of the bottle.
Choosing the Right Shortfill for the Device
A great-tasting shortfill can still perform badly in the wrong tank or pod. This is one of the most important points for retail teams and trade buyers building a reliable e-liquid range.
Higher-VG shortfills are thicker. They tend to work best with coils that have larger wicking ports and are intended for high-VG liquid. Used in a small, low-powered pod with a tight coil, thick liquid may wick too slowly. That can lead to dry hits, reduced flavour or shortened coil life.
A more balanced 50VG/50PG shortfill is usually thinner and may be better suited to refillable pod devices or mouth-to-lung tanks, provided the manufacturer confirms compatibility. Always encourage customers to check their device guidance before filling. The goal is not to sell the biggest bottle at any cost; it is to help the customer leave with liquid their kit can actually use.
Flavour is the other major buying decision. Fruit blends, icy flavours, sweet drinks, desserts, tobacco-inspired profiles and menthols each have loyal audiences. A sensible shortfill display covers proven favourites alongside a controlled number of newer flavours. For trade buyers, stock depth matters too: popular flavours need dependable replenishment, while trend-led lines are useful for keeping regular customers interested.
How to Add a Nicotine Shot Safely
Mixing is simple, but it should be done carefully. Nicotine e-liquid is for adult use only and should be kept away from children and pets. Customers should read the bottle label, avoid contact with skin and wash hands if any liquid is spilled.
To add a shot, remove the shortfill cap and nozzle if required, pour the nicotine shot into the bottle, refit the nozzle and cap firmly, then shake thoroughly. A few minutes of shaking is usually enough for a fresh mix, although some complex flavours may taste more settled after standing for a short period. The bottle should be stored upright in a cool, dark place with the cap secured.
Customers should never vape an e-liquid they suspect has been contaminated, incorrectly mixed or stored in a damaged bottle. If a product’s seal is broken before purchase or the packaging appears faulty, it should be set aside rather than sold.
Why Shortfills Make Commercial Sense for Retailers
Shortfills can increase average basket value without creating a complicated sales process. A customer buying a refillable kit may also need a shortfill, one or two nicotine shots, replacement coils or pods, and a spare bottle for travelling. For a trade buyer, that creates several repeat-purchase categories rather than a single transaction.
They also offer strong shelf appeal. Larger bottles make flavour branding easier to spot, while recognised e-liquid names give customers confidence. Stocking several bottle sizes helps meet different budgets: 50ml formats can be an approachable entry point, while 100ml and larger shortfills can offer better value for frequent users.
The trade-off is range management. Too many near-identical flavours can tie up cash and make the fixture harder to shop. Focus on known sellers, choose brands with consistent availability, and keep compatible nicotine shots close by. Clear labels showing bottle size, VG/PG ratio, nicotine status and intended device type reduce unnecessary questions at the till.
For adult customers using refillable hardware, a shortfill is a flexible, high-value way to keep their favourite flavour ready to go. Pair the bottle with the right nicotine shot and the right coil, and a routine refill becomes a purchase they will come back for.
