The 100ml problem nobody talks about
It's 5:47am at DFW. I'm in the TSA line. My Yeti is empty. The Starbucks past security has a line that snakes back to the gate, and my flight to Newark boards in 22 minutes.
This is the moment every traveler knows. You either pay $7 for an airport coffee you'll half-finish, gamble on the in-flight cart, or land in another time zone running on whatever caffeine you scraped together before sunrise.
I've been flying every month for the last three years building Drizz. Expo West. BevNet Live. Pitch meetings in New York. Family in Mexico City. I figured out the caffeine math the hard way, and the answer turned out to be sitting in my pocket the whole time.
Direct answer: yes, energy drops are TSA approved
Liquid caffeine in containers of 3.4 oz (100ml) or less is allowed in TSA carry-on bags, as long as the bottle fits inside your quart-sized 3-1-1 bag with your other liquids.
A bottle of Drizz Boost is 60ml. That's 40ml under the limit. One bottle contains 15 servings of green tea caffeine — 65mg per squeeze, 975mg total. You can pack the equivalent of a full week of energy drinks into something the size of a tube of lip balm and walk through security without a second glance.
That's the entire pitch. Everything below is the detail.
Table of contents
- The TSA 3-1-1 rule, explained without the runaround
- Why standard energy drinks fail at security
- How energy drops solve the carry-on caffeine problem
- What I actually pack for a red-eye
- Jet lag, time zones, and dose control at altitude
- International travel: the rules change
- Real Talk: what energy drops won't fix
The TSA 3-1-1 rule, explained without the runaround
The TSA's 3-1-1 liquids rule is simpler than people think:
- 3.4 ounces (100ml) per container, max
- 1 quart-sized clear bag to hold all of them
- 1 bag per passenger
That's it. The rule applies to liquids, gels, aerosols, creams, and pastes. Toothpaste, sunscreen, contact solution, cologne, energy drops — same bucket.
What trips people up is the "or less" part. The container has to be 100ml or smaller, regardless of how full it is. You can't bring a 500ml bottle that only has 80ml of liquid in it. The container itself disqualifies you.
The TSA also runs a Medical Liquids exemption for prescription medicines and baby formula, but supplements like caffeine drops don't qualify — they go through the standard 3-1-1 lane. Which is fine, because a 60ml bottle was always going to clear it anyway.
Why standard energy drinks fail at security
The math is brutal for cans:
| Drink | Volume | TSA carry-on? |
|---|---|---|
| Red Bull (standard can) | 250ml | ❌ Too big |
| Monster Energy | 473ml | ❌ Too big |
| Celsius | 355ml | ❌ Too big |
| 5-Hour Energy | 57ml | ✅ Allowed |
| Drizz Boost | 60ml | ✅ Allowed (15 servings) |
A standard Red Bull is 250ml, well over the 100ml TSA limit. Monster is 473ml. Celsius is 355ml. None of them make it through.
Your options at security are: chug it in front of the TSA agent, throw it away, or send it back through with the rest of your checked bag (assuming you haven't already cleared bag drop).
I've watched people slam an entire Red Bull at 6am because they couldn't bear to throw it away. I've also been that person. It's not a great morning.
5-Hour Energy figured this out years ago — their 57ml shot is TSA-compliant, which is part of why you see them at every airport convenience store. But you're paying $3.99 for a one-time hit with 200mg of synthetic caffeine and a flavor that, in my opinion, fights you the whole way down. The cost-per-dose math gets ugly fast.
How energy drops solve the carry-on caffeine problem
Energy drops — sometimes called liquid caffeine drops — solve three travel problems at once:
1. Volume. A 60ml bottle is 40% under the TSA limit. You're not even close to the line.
2. Dose control. Long flight, you want a smaller hit so you can sleep on the second leg? One squeeze (65mg). Red-eye landing into a 9am meeting? Two squeezes (130mg). You're not locked into a 200mg shot or a 300mg can.
3. Universal carrier. You can add drops to whatever drink you can get on the plane. Plain water from the flight attendant. The bad coffee they pour at 30,000 feet. The hotel lobby tea. Drizz is unflavored — virtually undetectable in strong-flavored drinks like coffee, with a whisper of sweetness in plain water.
That last one is the unlock. You're not dependent on what's available. You're not chugging a sour shot. You bring your caffeine source and use whatever liquid the world hands you.
What I actually pack for a red-eye
I fly to Newark or LaGuardia from DFW about once a month. Here's what's in my dop kit, every time:
- One bottle of Drizz Boost (60ml)
- A small electrolyte packet (LMNT or equivalent)
- A 32oz Yeti I fill at the water fountain after security
- Noise-canceling headphones
- A pen, because the flight attendant always needs one for customs forms
The Drizz lives in the same quart bag as my toothpaste. It's never been pulled out for secondary screening. It's never been questioned. It looks like a small unmarked liquid because that's what it is.
When I land, I have 14 more servings left for the rest of the trip. That's enough for a four-day Expo West run without buying a single energy drink at a hotel gift shop for $6.
Jet lag, time zones, and dose control at altitude
Cabin altitude is pressurized to about 6,000-8,000 feet. Research has shown that altitude can affect caffeine absorption and dehydration rates, and the dry cabin air pulls water out of you whether you notice it or not.
The standard travel mistake is doubling up — chugging two coffees before a flight to "stay ahead" of the jet lag. What actually happens is you crash four hours in, sleep through the part of the flight where you should be staying awake to reset your body clock, and land more disoriented than if you'd done nothing.
The smarter play is dosing. Published research on caffeine and L-theanine shows that the combination supports focus without the same spike-and-crash pattern as caffeine alone. Drizz has both, plus taurine.
My travel protocol:
- Pre-flight (90 min before boarding): One squeeze in water with electrolytes
- Mid-flight (if I want to stay awake): One squeeze in plane water
- Arrival day in a new time zone: Two squeezes mid-morning local time, then nothing past 2pm local
That's it. Three squeezes for a transatlantic. The bottle barely moves.
International travel: the rules change
This is where I see people get burned. The 100ml rule is the global standard — most international airports follow some version of it. But customs is different from security.
Some countries restrict supplement imports. Mexico's COFEPRIS regulates supplements as food products and is generally lenient for personal use. The UK and EU are similarly relaxed for personal quantities. Singapore and the UAE are stricter — declare anything you're not sure about.
My rule: keep the original label on, keep it under 60ml total volume, and don't pack 12 bottles for personal use. Customs agents read the label, see a small bottle of dietary supplement, and wave you through. They flag the people with unlabeled liquid in unmarked containers.
For trips back to Mexico City, I bring one bottle in my carry-on and have never been questioned. If you're flying somewhere with stricter import rules, check the destination's customs site before you pack.
Real Talk: what energy drops won't fix
I'm going to be honest, because that's the only voice this blog has.
Energy drops won't fix bad sleep. If you got three hours the night before a transatlantic flight, no amount of caffeine is going to make you sharp on landing. The CDC's guidance on jet lag is built around light exposure and sleep timing, not stimulants. Caffeine helps. It doesn't replace.
They also won't replace water. The number one mistake I see frequent flyers make is treating caffeine as hydration. It's not. You need both, and on a long flight you probably need more water than you think. Drink a full Yeti before the cart comes around the second time.
And — this is important — if you're sensitive to caffeine, pregnant, nursing, or on medication that interacts with stimulants, talk to your doctor before adding anything new to your travel routine. The convenience of TSA-compliance doesn't change the math on what your body can handle.
If you want a deeper read on travel-specific caffeine timing, check out our piece on caffeine without the crash.
The bottom line
The TSA rule is 100ml. Drizz is 60ml. That's the whole post.
But the reason this matters isn't just compliance — it's control. When your caffeine fits in your carry-on, you're not negotiating with a Starbucks line at 5am. You're not paying $6 for a Red Bull at the hotel mini-bar. You're not skipping a workout in a new time zone because the gym water tastes like chlorine and you need help.
You bring your energy with you. You dose it the way you need it. You use whatever drink the world hands you.
Try one bottle on your next trip. You'll know by the second flight whether it works for you.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your doctor before starting any new supplement, especially if you are pregnant, nursing, or have a medical condition.