Shoppers comparing pack formats
A large bottle, a multipack and a single can give you different ways to plan portions. Compare the volume you will actually use, especially when a bottle must be finished within a stated period after opening.
Who is each format for?
Zero-sugar shoppers watching caffeine
Sugar and caffeine are separate label details. Tesco lists KX Sugar Free Blue Spark at 30 mg caffeine per 100 ml, while Red Bull states 80 mg in a 250 ml Sugarfree can. Check both concentration and container size.
Shoppers wanting a sealed portion
A can may suit occasional use without opening a larger bottle. The choice between a 250 ml Red Bull Sugarfree can and a 500 ml Monster Energy Zero Sugar can also changes how much caffeine is in one container.
What should you check?
Start with the drink category and label, then compare caffeine across the portion sizes you would actually consume.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar and drink type | Read the sugars figure on the exact product label. Check whether a drink labelled “Zero” is an energy drink or a different type of soft drink. | I want a zero-sugar option, but I also need to know whether I am choosing an energy drink or a flavoured soft drink. |
| Caffeine per container | Compare caffeine concentration with container volume. Tesco lists KX Sugar Free Blue Spark at 30 mg per 100 ml, which is 300 mg across its 1L bottle; Sainsbury's lists Monster Energy Zero Sugar at 32 mg per 100 ml, or 160 mg in a 500 ml can. | A large container may be more than I intend to drink at once. I also need to account for caffeine from other drinks and supplements that day. |
| Portion format | Compare 250 ml and 500 ml cans with a 1L bottle. Red Bull states 80 mg caffeine per 250 ml Sugarfree can; Tesco instructs shoppers to consume its KX 1L bottle within three days of opening. | For occasional use, I may prefer a sealed can. If I choose a bottle, I need to plan portions and follow its after-opening instructions. |
| Product warnings | Read the caffeine warning and any stated restrictions on the individual drink. Do not use “sugar free” as a substitute for checking caffeine. | I want to know what one planned serving contains before choosing a pack to keep at home or take out. |
Common buying mistakes
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Treating a 1L bottle as one serving
Tesco lists KX Sugar Free Blue Spark at 30 mg caffeine per 100 ml. Drinking the whole bottle would mean consuming 300 mg caffeine.
Decide how much you intend to pour before opening it, and follow Tesco's instruction to consume it within three days of opening.
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Reading “zero sugar” as “caffeine-free”
Red Bull states 80 mg caffeine in a 250 ml Sugarfree can, and Sainsbury's lists Monster Energy Zero Sugar at 32 mg per 100 ml.
Check the caffeine declaration as well as the nutrition panel. If you want a zero-sugar soft drink rather than an energy drink, check that product's category and label separately.
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Choosing a large bottle without a plan to use it
An opened Tesco KX Sugar Free Blue Spark 1L bottle has a stated three-day consumption window. Sealed cans remain separate portions until opened.
Consider how often you will drink it and whether a bottle or individual cans fit that pattern.
Brands and drink ranges
Tesco KX
Tesco lists KX Sugar Free Blue Spark in a 1L bottle and a separate six-pack of 250 ml cans.
- The 1L bottle lists 0 g sugars and 30 mg caffeine per 100 ml.
- The full bottle contains 300 mg caffeine and carries an instruction to consume it within three days of opening.
Monster
Monster Energy Zero Sugar is listed in a four-pack of 500 ml cans.
- The retailer listings describe the four-pack as zero sugar.
- Sainsbury's lists 32 mg caffeine per 100 ml for that product, equivalent to 160 mg in a 500 ml can.
Red Bull
Red Bull Sugarfree is available in the cited retailer listings as 250 ml cans, including an eight-pack.
- Red Bull states that each 250 ml Sugarfree can contains 80 mg caffeine.
- A smaller can still contains caffeine; check the number of cans you intend to drink.
Relentless
Relentless has an energy-drink range, but the exact drink label matters when seeking a sugar-free option.
- Check a specific Relentless product's sugar and caffeine declarations rather than assuming the range shares one formulation.
Lucozade
Lucozade describes its Zero range as zero-sugar flavoured soft drinks.
- It is a separate option if you want a zero-sugar soft drink rather than specifically an energy drink.
- Check the individual label instead of assuming it has the caffeine profile of a zero-sugar energy drink.
Joybuy canned options
These zero-sugar energy drinks come in sealed 250 ml or 500 ml cans. Compare the pack format with the portion you intend to drink.
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Monster Energy Ultra Zero Sugar 4 × 500 ml
The four-pack gives you separate 500 ml cans. Check the caffeine declaration on this Ultra variant when deciding how much to drink.
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Red Bull Sugarfree 4 × 250 ml
The four-pack contains individual 250 ml cans. Red Bull states that a 250 ml Sugarfree can contains 80 mg caffeine; check the product warning before use.
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Monster Energy Green Zero Sugar 12 × 500 ml
This case contains twelve separate 500 ml cans, which Joybuy describes as containing no sugar. Read the caffeine declaration for this Green variant when planning a serving.
Questions about zero-sugar drinks
Does zero sugar mean an energy drink has little caffeine?
No. Sugar content does not tell you the caffeine dose. Tesco lists KX Sugar Free Blue Spark at 30 mg caffeine per 100 ml, while Red Bull states 80 mg in each 250 ml Sugarfree can; check the amount in the container you intend to drink.
How much caffeine is in the larger formats?
Tesco's stated 30 mg per 100 ml for KX Sugar Free Blue Spark works out to 300 mg across its 1L bottle. Sainsbury's stated 32 mg per 100 ml for Monster Energy Zero Sugar works out to 160 mg in one 500 ml can. Those are container totals, not suggested servings.
Should I count caffeine from other drinks too?
Yes. GOV.UK guidance citing the European Food Safety Authority's 2015 opinion says that up to 400 mg caffeine a day is unlikely to cause adverse effects for most individuals. Count caffeine from other sources as well, and follow the warnings on the particular product.
Is Lucozade Zero the same type of drink as a zero-sugar energy drink?
Not necessarily. Lucozade describes its Zero range as zero-sugar flavoured soft drinks. If you are choosing between it and an energy drink, read each product's label for its drink type, sugar content and caffeine declaration.