For bulk buying, choose by the caffeine and sugar in a whole can, not just the number of cans in the pack. A 250ml Red Bull can contains 80mg caffeine, while a 500ml Monster Ultra Zero Sugar can contains 150mg; the larger zero-sugar can suits a different serving preference, not necessarily the same caffeine plan.
If you keep cans for work, commuting, gaming or study, compare the amount in the can you will open. Red Bull UK states 80mg per 250ml can; the Monster Ultra Zero Sugar listing states 30mg per 100ml, which is 150mg in a 500ml can.
Red Bull Sugar Free and Monster Ultra Zero Sugar offer different can sizes. If considering Relentless Origin instead, its product listing states 19g sugars per 500ml can. Check the exact variant rather than treating every sparkling energy drink as nutritionally alike.
Pack count and can volume determine how many individual servings you are stocking. The listed formats include Red Bull Sugar Free 8 × 250ml, Monster Ultra Zero Sugar 9 × 500ml and Relentless Origin 4 × 500ml. Consider who will have access to the cans, particularly where a retailer applies an age restriction.
Start with the amount in one can, then check the exact variant and whether the pack format works for the people who will use it.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Compare mg per can, or multiply mg per 100ml by the can volume. Red Bull UK states 80mg per 250ml can; the Monster Ultra Zero Sugar listing states 30mg per 100ml, or 150mg per 500ml can. Include caffeine from other drinks that day. | I want to know the caffeine in the whole can before choosing how many to keep on hand. |
| Sugar and variant | Read the sugars line for the exact flavour and can size. Red Bull Sugar Free and Monster Ultra Zero Sugar are zero-sugar variants; the Relentless Origin listing states 19g sugars per 500ml can. | A sugar-free variant matters to me, or I would rather buy the standard drink after checking its label. |
| Pack format | Compare both can count and volume: 8 × 250ml, 9 × 500ml and 4 × 500ml provide different numbers and sizes of servings. Check the space needed to store the case. | Smaller cans may suit the portions I plan to use; for a shared supply, I also need enough individual cans. |
| Age restrictions | Check the caffeine warning on the exact drink and the retailer’s current age policy. Sainsbury’s says it does not sell high-caffeine energy drinks to under-16s. | If I am buying for a household or group, I need to consider who can purchase and access the drinks. |
The Monster Ultra Zero Sugar listing states 0g sugars but 30mg caffeine per 100ml. That amounts to 150mg in a full 500ml can.
Check the sugars line and caffeine declaration separately, using the full can as the serving you compare.
Eight 250ml cans and nine 500ml cans differ in both total volume and the size of each serving.
Check can count, volume per can and caffeine per can before deciding which format fits your plans.
Monster Ultra Zero Sugar is a zero-sugar variant, while the Relentless Origin listing states 19g sugars per 500ml can.
Confirm the flavour and variant on the product page or pack, then read its own nutrition and caffeine declarations.
Age policies can affect an order: Sainsbury’s says it does not sell high-caffeine energy drinks to under-16s. The UK government has announced an under-16 sales ban for England planned for April 2027.
Check the retailer’s current requirements before ordering for a household or group.
These references help distinguish drink ranges and pack formats; a retailer’s range is not itself a recommendation of every product it stocks.
Red Bull has 250ml cans in regular and Sugar Free multipacks.
Monster has 500ml energy drinks, including the Ultra Zero Sugar multipack.
Relentless Origin is a carbonated 500ml drink listed in multipack and case formats.
Lucozade describes Alert as its sparkling high-caffeine range, distinct from other Lucozade ranges.
Sainsbury’s lists national-brand drinks alongside its Blue Bolt and Blue Bolt Zero multipacks.
Tesco’s energy-drink range includes multipacks from Red Bull, Monster and Relentless.
These options cover several can sizes and pack counts for bulk buying. Compare each exact variant’s label before treating similarly sized cans as equivalent.
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Twelve 355ml cans offer a mid-sized can format for stocking up. Check the caffeine and nutrition declarations for this Kiwi Guava variant before choosing it for a shared supply.
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This 12-pack uses 500ml cans. If you plan to drink a whole can at a time, check its per-can caffeine amount and nutrition panel rather than comparing it only by pack count.
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Eight 250ml cans suit buyers seeking smaller individual servings and the Sugar Free variant. Its product listing states 32mg caffeine per 100ml, equivalent to 80mg per can; account for caffeine from other drinks too.
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This 12-pack keeps the individual can size at 250ml. Red Bull UK states 80mg caffeine per can for its regular energy drink; this is the regular variant, so check its sugars declaration rather than confusing it with Sugar Free.
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Nine 500ml cans provide a large-can Zero Sugar option. Check this Original Green variant’s own caffeine declaration: the figure for Monster Ultra Zero Sugar is not a substitute for its label.
Compare the amount in the whole can: multiply the stated mg per 100ml by 2.5 for a 250ml can or by 5 for a 500ml can. Red Bull UK states 80mg in its 250ml energy drink, while the Monster Ultra Zero Sugar listing states 30mg per 100ml, equivalent to 150mg in its 500ml can. Check other variants separately.
No. The Monster Ultra Zero Sugar listing states 0g sugars and 30mg caffeine per 100ml, equivalent to 150mg in a 500ml can. Read both declarations for the exact drink you intend to buy.
UK government guidance says drinks containing more than 150mg caffeine per litre require a high-caffeine warning and a caffeine amount stated in mg per 100ml. Use the can volume to work out the amount in a full can when that figure is not printed separately.
Check the retailer’s current policy: Sainsbury’s says it does not sell high-caffeine energy drinks to under-16s. In July 2026, the UK government announced an under-16 sales ban for England planned for April 2027; do not treat that future England measure as a current UK-wide rule.