Mad Blue Bar Series 100ml Shortfill E-Liquid

Overview

The Mad Blue Bar Series 100ml Shortfill E-Liquid by Bar Series in Mad Blue at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Bar Series Mad Blue 100ml Shortfill at a Glance

Bar Series 100ml Shortfill E-Liquid Mad Blue is a flavoured vape liquid in a large bottle, sold here at £11.99 and supplied at 0mg nicotine. It belongs to the Bar Series range, a brand we stock across several formats, and it sits in our shortfill e-liquids collection alongside other 100ml bottles built for tanks and refillable pod devices.

The headline detail is the volume. A standard UK e-liquid bottle holding nicotine is capped at 10ml, so a 100ml bottle only exists because the liquid inside has no nicotine in it. The maker fills the bottle with flavoured base, leaves empty room at the top and lets the buyer decide what happens next. You can vape it exactly as supplied, or, if you are an adult who already uses nicotine, you can add nicotine shots of your own to reach a strength that suits you.

The flavour name is Mad Blue. The listing does not break that down into named fruits, so we will not pretend to quote a recipe. What we can say is that the name belongs to a family of blue-style flavours that crop up across UK vape shops, and that Bar Series has used the same name across other formats, which makes it easy to sample before you commit to a big bottle. We cover that in more detail further down the page.

Who is this page for? Mainly adults who already own a tank or a refillable pod kit and are tired of paying for 10ml bottles one at a time. If you are brand new to vaping and unsure whether you need a bottle like this at all, read the sections on hardware and the numbers first. They will tell you quickly whether a 100ml shortfill fits the way you vape, or whether a simpler product would suit you better. Everything here is written for over 18s only, and nothing on this page is an invitation to start using nicotine.

Why the Bottle Has Room Left at the Top

A shortfill bottle looks under-filled, and that is exactly the point. The container is deliberately bigger than the liquid inside it. A 120ml bottle holding 100ml is the usual arrangement for this style of product, which leaves about 20ml of headroom, although the capacity printed on the label of the bottle that actually arrives is the figure to trust.

That headroom is not wasted space. It is there so you can add nicotine shots, which are small separate 10ml bottles of concentrated nicotine in a neutral base. Tip one or two into the bottle, put the nozzle back on, shake for a good half minute and the strength is set. The flavour work has already been done in the base, which is why a shot does not need to change what the liquid tastes like in any dramatic way. It just thins the flavour slightly, because the shot is flavourless.

Compare that with the other common way of buying liquid. A nicotine salt e-liquid arrives in 10ml, ready mixed at a fixed strength, designed for low-power devices. It is convenient, but you pay a higher price per millilitre and you get far less liquid. A shortfill reverses that trade: lower cost per ml, bigger bottle, but an extra step if you want nicotine, and a thicker liquid that suits different hardware.

The thickness matters. Shortfills are usually blended with a higher proportion of vegetable glycerine than salt liquids. The VG and PG split is not given in this listing, so check the bottle when it arrives. A thicker liquid tends to produce a softer, denser cloud and a rounder flavour, but it flows more slowly into the coil, which is why the choice of device is so important. We deal with that properly in the hardware section.

Reading the Mad Blue Flavour Name

Names like Mad Blue are marketing shorthand. They tell you the colour of the experience more than the ingredients. The listing carries no fruit tags for this flavour, and Bar Series does not publish a note-by-note description on the product page, so anything we say about taste is a description of the flavour family, not a precise recipe.

With that caveat in place, here is the pattern across the UK market. Blue-named flavours in e-liquid tend to sit in the berry and candy corner of the menu. Think blueberry, blue raspberry, sometimes a dark berry with a faint tang, often sweetened and occasionally finished with a cool edge. They are rarely dessert flavours and rarely tobacco or mint. If you like a juicy, slightly sweet fruit vape that does not taste like any single fruit in particular, this is the neighbourhood you are shopping in.

The best way to judge it before you spend £11.99 on 100ml is to look at where else the name appears. Mad Blue is listed in other Bar Series formats, including nicotine salts and prefilled Kika 8K pods. If you have already tried it in one of those, the shortfill should read as the same flavour family, though a nicotine salt and a shortfill never taste identical because the base liquids differ. If you have not tried it, a small nicotine salt bottle or a single pod is a cheaper test than a full 100ml commitment.

Expect the taste to be the star and the throat sensation to be gentle. Low-nicotine or nicotine-free shortfills are smooth by design, so there is no hit to cover for the flavour. Whether you find it sweet enough or too sweet is personal, and we would sooner say that honestly than promise a profile the listing does not state. If you want to compare it against its siblings, the brand page shows the other Bar Series 100ml flavours, several of which lean on blueberry.

Who Mad Blue Shortfill Suits

Start with hardware, because it settles the question faster than flavour does. This liquid is for people who own, or plan to buy, a device with a refillable tank. That includes sub-ohm tanks, refillable pod systems and open pod kits with an opening for pouring in liquid. If your current vape is a sealed disposable, a shortfill does nothing for you until you also buy a rechargeable, refillable device.

Next, think about how you use your vape. Someone who takes a handful of puffs on the way to the station may find a 100ml bottle absurd. Someone who vapes steadily through the day, tops up a tank every day or two and resents the cost of constantly buying small bottles is exactly who the format was designed for. The bigger the bottle, the lower the cost per millilitre, and the fewer deliveries you need to plan.

It also suits adults who want control. With a shortfill you set the nicotine level yourself, from none at all to a modest strength, and you can change it between bottles. Some people vape at 0mg because they no longer want nicotine but enjoy the habit and the flavour. Others add one shot, others two. All of that flexibility is built into the format.

Who should look elsewhere? Anyone who wants a high nicotine strength in a tiny low-power device is better served by salts. Anyone who has never vaped and wants the simplest possible start may prefer a sealed or prefilled device. Anyone under 18 must not buy or use this product. We run age verification at checkout, and the details are on the age verification page linked at the end of this guide.

The Numbers Behind the 100ml Bottle

Some figures are fixed by the listing, and some are simple arithmetic you can do yourself. The fixed ones first: the bottle contains 100ml of liquid, the nicotine strength as supplied is 0mg, the flavour is Mad Blue, and the price is £11.99. That works out at roughly 12p per millilitre, a figure that is hard to match with 10ml bottles bought one at a time.

Now the tank maths, which is category-level and does not depend on this brand. Under UK rules, a refillable tank or pod cannot hold more than 2ml. So a 100ml bottle contains enough liquid for about 50 full tank fills if you never spill a drop. Divide £11.99 by 50 and each full tank costs around 24p in liquid. Real life will be a little different, because a tank is rarely run completely dry and a small amount of liquid is always lost to priming and wicking.

How long does a bottle last? That depends entirely on how much you vape and how much power your device uses. A light user might make a bottle stretch over several weeks. A heavy sub-ohm user could finish one far sooner. We do not publish a figure here because the honest answer is a very wide range, and we would rather you track your own first bottle than trust a made-up average.

Then the nicotine arithmetic, for adults who choose to add shots. A 10ml shot at 18mg per ml contains 180mg of nicotine. Add one to 100ml of liquid and you have 110ml at about 1.6mg per ml. Add two shots to a 120ml bottle and you have 360mg across 120ml, which is 3mg per ml. A 20mg shot gives roughly 1.8mg per ml with one shot and 3.3mg per ml with two. These are calculations, not recommendations, and the label on your bottle governs how much room you really have.

Filling Your Tank Step by Step

Once the bottle arrives, treat the first fill as a short routine rather than a rush. Wash your hands, switch the device off and make sure it is unplugged from any charger. Unscrew the top of the tank or open the fill port, according to your design, and keep the tank upright so liquid does not run into the central airflow tube.

Most bottles of this kind come with a fine, narrow nozzle that fits neatly into a fill port. Squeeze gently and aim for the side wall of the tank rather than straight down the middle. Stop just below the maximum line. Overfilling is the most common cause of leaks, because there is no spare air space to absorb the changes in pressure as you vape and as the device warms up.

Then comes the step people skip. Let the filled tank stand for five to ten minutes before you take the first puff. A new or recently replaced coil needs time to soak, particularly with a thicker liquid. A dry coil burns the cotton, tastes harsh and shortens the life of the coil. If you are fitting a brand new coil as well, a few drops straight onto its wicking holes before you reassemble helps. Our vape coils range lists replacements for the popular kits, and it is worth keeping a spare, because you will want to swap a tired coil rather than blame the flavour.

On the first few puffs, take short, gentle draws without pressing the button for long. This primes the wick and lets the liquid settle into the cotton. Once the vapour feels smooth and the flavour has come through, you can vape as normal. When the tank is down to a quarter, top it up, and wipe any drips from the threads before you close it. A tidy fill is a leak-free fill.

Adding Nicotine Shots the Right Way

Nicotine is addictive, and it is only for adults who already use it. If you do not use nicotine, leave the bottle at 0mg and enjoy the flavour as it comes. Nothing about this product requires nicotine, and nobody should start using it because of a flavour.

For existing nicotine users, adding a shot is straightforward but needs care. First, check how much empty space the bottle has. Open the cap, remove the nozzle, then squeeze the shot bottle in slowly so nothing splashes. Replace the nozzle, tighten the cap and shake firmly for about thirty seconds. Then leave the bottle for several hours, or overnight, so the nicotine blends fully before you use it. Shaking again before you refill the tank each time is a good habit.

Pay attention to shot strength. Nicotine shots in the UK are sold in 10ml bottles, and they come in more than one strength, with 18mg per ml very common. Using a different strength changes your final result, so do the sum before you pour. The calculations in the numbers section above will help. If you only want a mild level, one shot in 110ml is a sensible starting point, and you can always add a second later, but you cannot take nicotine back out.

If you would rather vape nicotine-free but are exploring other bottles first, our nicotine-free e-liquids collection gathers the range in one place. And if what you really want is a higher fixed strength in a small bottle, a shortfill is the wrong tool, so look at salts instead. Always store shots separately, well away from children and pets.

Matching the Liquid to Your Hardware

This is the section that saves returns. A shortfill is a thicker liquid than most nicotine salts, and it wants a device that can feed it to the coil quickly enough. Sub-ohm tanks are the traditional match. Many modern refillable vape pods also handle higher VG liquids, especially if they take mesh coils designed for thicker blends. Check the manual or the coil packaging, which usually states a recommended VG range or liquid type.

If your device is a small, low-power pod system built around salts, a thick liquid may struggle. Signs include weak flavour, gurgling, a burnt taste after a few draws, or a coil that dies within days. In that case, either choose a coil designed for thicker liquids or change the liquid type. If the whole business of refilling sounds like more effort than you want, prefilled pods are a separate route that skips it entirely, though they cost more per millilitre of liquid and offer no control over strength.

What about closed pod kits? These use sealed or prefilled cartridges, and you cannot pour a shortfill into them. They are a different category, and mixing the two up is a very common reason for confusion. If your device takes a cartridge that clicks in and cannot be opened, this bottle is not for it.

Finally, think about upgrades. If you enjoy the liquid and find it works well in a basic kit, a better tank or a mesh coil may improve flavour and airflow without changing the bottle at all. Keep your first coil as a baseline, change it every one to two weeks if the taste fades, and note which settings give you the smoothest result. Small changes to wattage often matter more than people expect.

Storing the Bottle and Keeping Flavour Fresh

E-liquid is more resilient than it looks, but it does not like heat, light or air. A 100ml bottle will often be open and in use for weeks or months, so a few storage habits make a real difference to how it tastes in the last third of the bottle.

Keep it somewhere cool and out of direct sunlight. A cupboard, drawer or shelf away from a radiator is ideal. Avoid leaving it in a car on a warm day, because heat can alter the liquid, thin it and degrade the flavour. Light is the other enemy, especially for the lighter fruit notes, so an opaque bag or box helps if the bottle is translucent.

Always tighten the cap fully after filling your tank. Air exposure slowly dulls flavour, and a loosely closed nozzle invites dust and the occasional spill. Wipe the nozzle tip after each use, since dried liquid can crust around it and harden. Stand the bottle upright and, if it travels in a bag, put it inside a sealed plastic pouch as insurance against leaks.

Safety belongs in this section too. Store the bottle and any nicotine shots out of reach of children and pets. Never decant liquid into drinks bottles or unmarked containers. If you have added nicotine, consider writing the strength and the date on a small label, because it is easy to forget which batch is which after a few weeks. Check your liquid before each refill: if the colour has darkened a lot, the smell is odd or the flavour has turned flat and bitter, it is time to replace it. Properly stored e-liquid generally keeps its character for many months, but the printed date on the bottle is your guide.

Pros and Cons Worth Weighing

Every format has trade-offs, and an honest buying guide should lay them out. Here is how this one stacks up.

What works in its favour:

• A low cost per millilitre, around 12p, which is hard to beat with smaller bottles.
• A big bottle that cuts down on reordering and packaging waste.
• Control over nicotine strength, from none at all to a modest level for existing users.
• Compatibility with tanks and refillable pods that suit thicker liquids.
• A consistent flavour across the whole bottle, so you are not replacing it every few days.

What counts against it:

• It needs a refillable device. It is no use with sealed pods or disposables.
• Adding shots is an extra step and requires a little care and some basic arithmetic.
• The listing does not name the fruits, so the exact taste is a matter of trying it.
• A thick liquid can overwhelm small low-power devices.
• It is a larger upfront spend than a single disposable or a 10ml bottle.

That last point deserves context. A disposable vape is a sealed, ready-to-use device you throw away. It has zero setup and no refilling, which is its appeal. A shortfill is the opposite: more effort, more control, lower long-term cost per millilitre if you vape often. Neither is better in every case. The right answer is whichever fits your habits, your budget and your patience.

If you are undecided, a useful test is to ask how many disposables you buy in a month. If the answer is several, a refillable kit plus a bottle like this can work out noticeably cheaper over time, although the first purchase of hardware has to be factored in. If the answer is one or none, stay with what you have.

Troubleshooting Leaks, Gurgling and Flat Flavour

Most problems with shortfills trace back to a handful of causes, and most are easy to fix. Work through them in order before you decide the liquid is at fault.

Leaking. The usual culprits are overfilling, a loose tank thread or a worn seal. Fill to just under the line, check the base is screwed down firmly and wipe the threads before assembly. If a tank leaks only after being left on its side, store it upright. Persistent leaks despite correct filling usually mean a damaged O-ring or a cracked tank, and a replacement is cheaper than constant cleaning.

Gurgling or spitting. This happens when liquid floods the coil chamber. Too much liquid in the chamber, a coil that has not been primed or a device being used at too low a setting for a thick liquid can all cause it. Remove the tank, blow gently through the drip tip to clear it and let it rest for a minute.

Weak or burnt flavour. A tired coil is the most common reason. Cotton darkens and the sweetness in a fruit liquid can scorch quickly, leaving a harsh edge that has nothing to do with the bottle. Swap the coil, prime it well and try again. If the flavour is flat on the first puffs of a new bottle, shake it and give it several hours to settle, especially after adding shots.

Dry hits. A sharp, unpleasant hit usually means the wick is not getting enough liquid. Lower the power, take shorter puffs and check that the liquid level has not dropped too low. Our FAQ page covers common store, order and device questions, and our team can help if you are stuck. Never keep vaping through a burnt taste; it is a signal to change the coil, not to push on.

Delivery, Age Checks and Buying Here

Buying a 100ml bottle online is straightforward, but a few practicalities are worth knowing. Orders over £20 qualify for free UK delivery, so a single bottle at £11.99 will need a little something else in the basket to cross the threshold. A spare coil or a second flavour usually does it. Orders placed before 4pm are dispatched the same day, and the delivery and returns page sets out the full detail on options, timings and what to do if something goes wrong.

Because this is a nicotine-capable product category, we verify age. Vaping products are for adults only, and our checkout includes an age check before an order can be completed. The age verification page explains how it works and why we run it. We cannot make exceptions, and we will refuse any order we have reason to believe is for someone under 18.

Our stock is 100% genuine, and parcels go out in discreet plain packaging with no branding on the outside. If a bottle arrives damaged, or something is not as described, contact the team promptly with your order number and a photo. Do not use a bottle that has leaked heavily in transit or whose seal is broken, and keep the packaging until the issue is resolved.

Finally, remember that a shortfill is only half the setup. Make sure you have a compatible tank or refillable pod, a spare coil and, if you intend to add nicotine, shots in a strength you have worked out in advance. Buy them together and you avoid a second delivery. If you are building a basket for a few weeks of vaping, it is worth checking the site for any current offers before you pay.