Rockstar Original has more caffeine than Bubly Bounce caffeinated sparkling water on both counts: 160mg per 16 oz can against 35mg per 12 oz can, and about 10mg per fluid ounce against 3. The serving sizes differ, so the table below shows both ways of counting.
Bubly Bounce caffeinated sparkling water vs Rockstar Original: the numbers
| Bubly Bounce caffeinated sparkling water | Rockstar Original | |
|---|---|---|
| Caffeine per serving | 35mg per 12 oz can | 160mg per 16 oz can |
| Caffeine per fl oz | 2.9mg | 10.0mg |
| Servings to reach 400mg (FDA context) | 11.4 | 2.5 |
Sources: Bubly Bounce caffeinated sparkling water's figure is verified in our Bubly Bounce caffeinated sparkling water caffeine guide against Caffeine Informer (source); Rockstar Original's figure is verified in our Rockstar Original guide against Rockstar product page (source).
The concentration gap is the striking part: Rockstar Original packs roughly 3 times the caffeine per ounce. Sipping speed matters at that density; a 16 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Bubly Bounce caffeinated sparkling water when you want the lighter dose or a slower ramp, and Rockstar Original when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- Bubly Bounce caffeinated sparkling water: the full caffeine guide
- Rockstar Original: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
As an Amazon Associate, Barista Life earns from qualifying purchases.
Gear from this guide
FAQ
Does Bubly Bounce caffeinated sparkling water or Rockstar Original have more caffeine? Rockstar Original: 160mg per 16 oz can versus 35mg per 12 oz can for Bubly Bounce caffeinated sparkling water.
Which is stronger per ounce? Rockstar Original, at about 10.0mg per fluid ounce versus 2.9mg for Bubly Bounce caffeinated sparkling water.
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.
Get the good coffee stuff
One email a week: what we verified, what is worth buying, and what is not. No spam, unsubscribe any time.