Adults planning individual servings
Check caffeine per can before dividing a pack between guests. Tesco lists 32mg per 100ml for original Red Bull, or 80mg in a 250ml can; Monster Energy UK lists 160mg in a 500ml Original Green can.
Who is choosing the drinks?
Adults looking for a sugar-free option
Read the sugar and caffeine declarations separately. Tesco lists Red Bull Zero as having no sugar but still carrying a high-caffeine warning; Sainsbury’s gives the same warning for Monster Zero Sugar.
Organisers serving a mixed group
Provide other drinks for guests for whom the energy-drink label advises against consumption. The Red Bull and Monster listings warn against use by children and pregnant or breast-feeding women; the Monster Zero Sugar listing also names people sensitive to caffeine.
What should you check?
Decide who will drink each can, then compare the serving size, label and number of cans in the pack.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Compare the declared caffeine per 100ml and the can volume. Tesco’s original Red Bull listing gives 32mg per 100ml, or 80mg per 250ml can; Monster Energy UK states 160mg per 500ml Original Green can. | I want each adult to know how much caffeine is in their can, especially if they also drink coffee, tea or other caffeinated drinks. |
| Sugar and formulation | Read the sugar declaration for the exact variant, then check caffeine separately. Tesco lists original Red Bull at 11g sugars per 100ml and Red Bull Zero at 0g per 100ml; both listings carry a high-caffeine warning. | If I choose a sugar-free drink, I still want to know its caffeine content. |
| Who will drink it | Read the warning on the exact can. Tesco’s Red Bull listing advises against consumption by children and pregnant or breast-feeding women; Sainsbury’s Monster Zero Sugar listing also names people sensitive to caffeine. | Some guests may need a drink other than an energy drink, so I do not want every can in the shared supply to be high caffeine. |
| Pack configuration | Check both can count and volume. Tesco lists original Red Bull packs of 4, 8 and 12 cans at 250ml each; Sainsbury’s lists a 9 × 500ml Monster pack. | I want enough individual cans for the adults who choose one, without treating a 500ml can as the same serving as a 250ml can. |
Picnic buying pitfalls
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Treating 250ml and 500ml cans as interchangeable
Can volume changes the amount consumed in one serving. Tesco’s 250ml original Red Bull contains 80mg caffeine, while Monster Energy UK states 160mg for its 500ml Original Green can.
Choose the can size for the intended adult drinker, and read caffeine per can rather than judging by the number of cans in the pack.
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Assuming sugar-free means less caffeine
Tesco’s Red Bull Zero and Sainsbury’s Monster Zero Sugar listings both carry high-caffeine warnings.
Check the sugar line and caffeine declaration independently for the exact flavour and can size.
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Putting high-caffeine cans into a shared supply
Product warnings on the cited Red Bull and Monster listings advise against consumption by children and pregnant or breast-feeding women. The Monster Zero Sugar listing also warns people sensitive to caffeine.
Keep alternative drinks available and make the energy drinks easy for guests to distinguish from them.
Brand and range references
Red Bull
Tesco lists original Red Bull in 250ml multi-pack cans, alongside a 4 × 250ml Red Bull Zero pack.
- Tesco’s original 250ml listing gives 32mg caffeine per 100ml, equivalent to 80mg per can.
- Tesco lists 11g sugars per 100ml for the original drink. Its Zero listing has 0g sugars per 100ml but still carries a high-caffeine warning.
Monster
Sainsbury’s lists Monster multi-packs with 500ml cans, including Original and Zero Sugar products.
- Monster Energy UK states that Original Green contains 160mg caffeine per 500ml can.
- Monster Energy UK lists 55g sugar per 500ml Original Green can. Sainsbury’s Zero Sugar listing carries a high-caffeine warning despite its different sugar content.
Relentless
Tesco lists a Relentless Origin 4 × 500ml pack.
- The listed configuration provides four individual 500ml cans.
- Read the caffeine, sugar and warning declarations on the exact pack before comparing it with another drink.
Lucozade
Tesco lists Lucozade Energy 8 × 380ml multi-packs, and Lucozade describes its Energy range as containing glucose.
- The Tesco listing identifies an eight-can, 380ml format.
- Check the exact pack’s caffeine and sugar declarations rather than assuming they match those of Red Bull or Monster.
Joybuy multi-pack options
These individual-can multi-packs offer 250ml Red Bull variants and a 355ml CELSIUS variant for an adult picnic. Compare the exact can labels when caffeine or sugar content matters to your choice.
No image availableRed Bull Energy Drink, 12 × 250ml
Twelve individual 250ml cans suit a picnic where adults want smaller servings. Tesco declares 32mg caffeine per 100ml for the original 250ml Red Bull drink; check the can’s sugar declaration and high-caffeine warning.
No image availableRed Bull Energy Drink, 8 × 250ml
Eight 250ml cans provide individual servings for adults who prefer that can size. Tesco declares 32mg caffeine and 11g sugars per 100ml for original Red Bull; read the warning on the can.
No image availableRed Bull Energy Drink, 24 × 250ml
This 24-can pack keeps the individual serving size at 250ml when more cans are needed. Tesco declares 32mg caffeine per 100ml for original Red Bull; account for each drinker’s other caffeine sources and read the can warning.
No image availableRed Bull Sugarfree Energy Drink, 24 × 250ml
This Sugarfree variant provides 24 individual 250ml cans. Sugar-free wording does not establish a lower caffeine content: read the caffeine declaration and warning on this exact variant.
No image availableCELSIUS Kiwi Guava, 12 × 355ml
Each of the 12 Kiwi Guava cans holds 355ml, a larger individual serving than the 250ml options above. Check this variant’s caffeine and sugar declarations and its can warning before sharing the pack.
Common questions
How do I compare caffeine in picnic cans?
Compare caffeine per can, not just per 100ml or per pack. Tesco’s original Red Bull listing states 32mg per 100ml, which is 80mg in a 250ml can; Monster Energy UK states 160mg in a 500ml Original Green can. Check the declaration on any other variant separately.
Is an under-16 energy-drink sales ban already in force across the UK?
No UK-wide rule follows from the England announcement. In July 2026, the Department of Health and Social Care and Department for Education announced an intended ban in England from April 2027 on sales to under-16s of energy drinks containing more than 150mg caffeine per litre, subject to Parliamentary approval. That announcement should not be treated as a rule already in force or as a timetable for other UK nations.
Does sugar-free mean an energy drink has less caffeine?
No: a sugar-free description does not tell you the caffeine dose. Tesco lists Red Bull Zero as having no sugar but carrying a high-caffeine warning; Sainsbury’s lists Monster Zero Sugar with a high-caffeine warning at 32mg per 100ml. Check the exact drink’s caffeine declaration and can volume.