A 250ml multipack makes sense if you want a smaller can and an easy-to-track caffeine amount: Red Bull says its Sugarfree can contains 80mg, while the Tesco and Sainsbury's 250ml own-label examples state 30mg per 100ml, equivalent to 75mg per can. A 500ml can is a different serving choice: Monster says its zero-sugar Ultra contains 150mg caffeine per can. For a weekday routine, compare the exact can's caffeine and sugar declarations, then choose a pack size you can use.
A 250ml format lets you compare caffeine by can. Red Bull states that Sugarfree contains 80mg per 250ml; Tesco Blue Spark Sugar Free and Sainsbury's Blue Bolt Zero list 30mg per 100ml, equivalent to 75mg in a 250ml can.
Check sugar and caffeine separately. Monster says its zero-sugar Ultra contains 150mg caffeine in a 500ml can, so zero sugar does not mean caffeine-free.
Pack count alone can obscure how much drink each multipack contains. The Sainsbury's examples include Lucozade Energy Original 12 × 330ml and Relentless Origin 4 × 500ml; compare the individual cans as well as the number in the pack.
Start with the amount in one can, then check its sugar declaration and whether the pack format works for your routine.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Read both the caffeine amount per 100ml and the can volume. Red Bull states 80mg per 250ml Sugarfree can; Monster states 150mg per 500ml Ultra can. | I want to know how much caffeine is in one breakfast can, particularly if I also expect to have coffee, tea or another caffeinated drink. |
| Sugar choice | Check the exact variant's sugar declaration independently of its caffeine figure. Lucozade describes its Energy range as containing glucose; a shared category name does not establish the same formulation. | A zero-sugar option may suit what I am looking for, but I do not want to mistake that wording for a lower caffeine amount. |
| Pack format | Compare can volume and pack count together, and confirm stock when ordering. Tesco marked its Blue Spark Sugar Free 6 × 250ml listing out of stock at the time checked. | For weekday use, I want cans in a size I will actually choose each morning and a pack I can obtain when needed. |
| On-can cautions | Read the warning on the exact drink rather than relying on its flavour or sugar claim. Product cautions can matter for children, pregnancy, breastfeeding or sensitivity to caffeine. | I need to check whether the can's stated cautions apply to the person who will drink it. |
Monster states that its zero-sugar Ultra contains 150mg caffeine per 500ml can. The sugar declaration does not tell you the caffeine amount.
Read the caffeine declaration for the exact can size alongside its sugar information.
Red Bull states 80mg caffeine in a 250ml Sugarfree can, while Monster states 150mg in a 500ml Ultra can. Comparing pack counts alone misses that difference per can.
Choose the can size first, then compare variants and multipack counts within the format you want.
A product listing can remain visible when the pack cannot be ordered: Tesco marked its Blue Spark Sugar Free six-pack out of stock at the time checked.
Confirm availability before relying on a particular pack for a repeat weekday purchase.
Lucozade describes its Energy range as containing glucose. That category name does not establish the caffeine or sugar content of an individual can.
Use the exact can's nutrition panel and caffeine declaration when considering a substitute.
A 250ml-can option for shoppers comparing smaller servings, including a Sugarfree variant.
A larger-can reference for zero-sugar multipacks.
Relentless Origin appeared in a 4 × 500ml multipack in Sainsbury's listings.
Its Energy range includes canned multipacks, including Original 12 × 330ml in Sainsbury's listings.
Blue Spark Sugar Free is a 6 × 250ml own-label multipack.
Blue Bolt Zero is a 6 × 250ml own-label multipack.
These canned multipacks include 250ml and 500ml options. Compare the exact variant and its on-can information before choosing one for a weekday breakfast routine.
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This 12-pack contains 500ml cans. If you are choosing a larger breakfast can, check its caffeine and sugar declarations and the cautions on the label.
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This four-pack offers 500ml cans. Check Ultra Rosa's own caffeine and sugar declarations rather than applying figures from another Monster Ultra variant.
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Eight 250ml cans provide a smaller-can format for a weekday routine. This is the standard Energy Drink variant, not Red Bull Sugarfree; check its sugar declaration when choosing between them.
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This 12-pack combines 250ml cans with the Sugarfree variant. Red Bull states that each 250ml Sugarfree can contains 80mg caffeine; check that serving alongside any other caffeine you expect to have that day.
Red Bull states that a 250ml Sugarfree can contains 80mg caffeine, while Monster states that a 500ml Ultra Zero Sugar can contains 150mg. Tesco Blue Spark Sugar Free and Sainsbury's Blue Bolt Zero each list 30mg per 100ml, equivalent to 75mg in their 250ml cans. Check the exact variant before applying these figures to another multipack.
No. Monster states that its Ultra Zero Sugar contains 150mg caffeine per 500ml can, and the Tesco and Sainsbury's 250ml own-label examples list 30mg per 100ml. Read the sugar and caffeine declarations separately.
Check the retailer's policy and the rules applicable where the order is placed. Sainsbury's says it does not sell high-caffeine energy drinks to under-16s and may ask for proof of age on delivery. In July 2026, the Department of Health and Social Care described an intended ban on sales to under-16s in England; that statement does not establish a UK-wide rule already in force.
Check both the number of cans and the volume of each can, then compare caffeine by individual can rather than by pack name alone. For example, the Sainsbury's listings include Lucozade Energy Original 12 × 330ml and Relentless Origin 4 × 500ml, which provide different serving sizes as well as different pack counts.