Cans can rupture in checked luggage, but explosion is rare — pressure changes and temperature shifts are the real risk

Cans rupture in checked baggage because the cargo hold is unpressurized or only partially pressurized, and the air pressure drops as the plane climbs. A sealed can that left the ground at 14.7 pounds per square inch (normal air pressure) may experience pressure as low as 8 psi at cruising altitude. The air inside the can pushes outward against a lower external pressure, and if the can is already weakened — by a dent, a manufacturing flaw, or carbonation — it can split open or spray its contents. Temperature swings make this worse: a cold cargo hold followed by a warm baggage claim area can cause pressure inside the can to spike again.

The word "explode" overstates what happens. You will not see a dramatic burst. Instead, you get a slow leak or a split seam that soaks your clothes and other luggage. Carbonated beverages are at higher risk than still drinks because the gas inside them is already under pressure. Aluminum cans are more prone to rupture than glass bottles, which are rigid and less likely to fail under pressure change.

Key Takeaways

  • Cans rupture most often because air pressure in the cargo hold is lower than the pressure inside a sealed can, forcing the can outward until it splits.
  • Carbonated drinks and energy drinks carry the highest risk because they already contain pressurized gas.
  • A dent, crack, or manufacturing weakness makes rupture much more likely, even if the can looks fine to you.
  • Packing cans in the center of your bag, surrounded by soft items, reduces the chance of damage from pressure and impact.
  • Checked baggage rules vary by airline — some prohibit all liquids and gels in checked bags, while others allow sealed cans in limited quantities.

Why Pressure Changes Cause Cans to Fail

A sealed can is a closed system. The liquid and gas inside occupy a fixed volume, and the pressure inside that can is higher than the air around it — especially for carbonated drinks. When the plane climbs and the cargo hold pressure drops, the air pushing inward on the can becomes weaker. The pressure inside the can now pushes outward harder than the external pressure pushes inward. If the can's metal is thin or already compromised, it gives way.

This process happens gradually over the flight, not suddenly. You will not hear a bang. Instead, the can slowly leaks or develops a pinhole, and by the time you open your bag at your destination, your belongings are wet. Carbonated beverages are especially vulnerable because they are pressurized to begin with — a typical soda can contains about 4 volumes of carbon dioxide gas, meaning the gas inside is already pushing hard against the aluminum walls.

Temperature also plays a role. If the cargo hold is cold during flight and then warms up on the tarmac or in baggage claim, the gas inside the can expands, raising internal pressure even further. This temperature swing can be the final stress that causes a weakened can to fail.

Which Drinks and Cans Are at Highest Risk

Carbonated soft drinks, energy drinks, and beer are the riskiest because they are pressurized. A sealed can of soda or energy drink contains gas under pressure, so the internal pressure is already high before the plane even takes off. When external pressure drops, the difference between inside and outside pressure becomes extreme.

Still drinks — water, juice, or non-carbonated beverages — are safer because they contain no pressurized gas. The liquid inside is at roughly atmospheric pressure, so a drop in external pressure is less likely to cause rupture. However, a still drink in a dented or weakened can can still leak or split.

Aluminum cans are more vulnerable than glass bottles. Glass is rigid and does not deform under pressure, so it is far less likely to rupture. Aluminum is thin and flexible, which makes it lighter but also more prone to failure when pressure imbalances occur. Plastic bottles fall somewhere in between — they can deform and leak, but they are less likely to rupture completely than aluminum cans.

How to Pack Cans Safely in Checked Luggage

If your airline allows cans in checked bags, pack them in the center of your suitcase, surrounded by soft items like clothing, towels, or bubble wrap. This cushioning absorbs pressure changes and protects the can from impact damage during handling. Avoid packing cans near the edges or corners of your bag, where they are more likely to be crushed or bent during loading and unloading.

Inspect every can before packing. Look for dents, cracks, leaks, or any sign of damage. A can that is already weakened will fail more easily under pressure change. If you see any damage, do not pack it — the risk is too high.

Pack cans in a separate plastic bag or waterproof pouch inside your suitcase. If a can does rupture, the pouch will contain the spill and protect your other belongings. Zip-lock bags work well for this purpose, or you can buy a small waterproof packing cube designed for liquids.

Keep cans away from electronics, documents, and anything that water damage would ruin. Even if the can does not rupture, condensation can form on the outside of a cold can, and that moisture can seep into your bag.

Airline Rules for Cans in Checked Baggage

Rules vary by airline and by what is inside the can. Most major airlines prohibit all liquids, gels, and aerosols in carry-on bags but allow them in checked baggage in limited quantities. However, some airlines have stricter rules for checked bags as well, especially for hazardous materials like alcohol or pressurized containers.

Carbonated beverages are sometimes classified as hazardous because of the pressure inside them. Check your airline's baggage policy before you pack. You can usually find this on the airline's website under "Prohibited Items" or "Baggage Rules." If the policy is unclear, call the airline or ask at check-in — they can tell you whether your specific cans are allowed.

International flights may have different rules than domestic flights. If you are traveling internationally, check the rules for both your departure airline and any connecting airlines. Some countries restrict the import of certain beverages, and some airlines are stricter on international routes.

What to Do If a Can Ruptures During Flight

If you open your checked bag and find a ruptured can, document the damage with photos. If the spill damaged other items in your bag, keep those items and take photos of them as well. Some airlines will reimburse you for damage to checked baggage, though the amount is usually limited and you will need to file a claim within a specific time frame — often 24 to 48 hours after arrival.

Check your airline's policy on baggage damage claims. You will typically need to file a written claim with the airline, include photos and receipts for damaged items, and provide proof that the damage occurred during their handling of your bag. Reimbursement is not may provide, and the airline may dispute the claim if they believe the damage was caused by something other than their handling.

To prevent this situation in the future, consider shipping beverages to your destination instead of packing them in your bag. Many online retailers ship beverages, and the cost may be less than the risk of damage to your luggage and belongings.

Alternatives to Packing Cans in Checked Luggage

The safest option is to buy beverages after you arrive at your destination. Most airports have shops, convenience stores, and vending machines where you can purchase drinks. This eliminates the pressure and temperature risk entirely and saves luggage space.

If you need a specific beverage that is hard to find at your destination, consider shipping it ahead. Many online retailers ship beverages to hotels or addresses, and you can arrange for the package to arrive before you do. This costs more than packing it yourself, but it eliminates the risk of rupture and damage.

For road trips or short drives, packing cans is much safer because the pressure and temperature changes are minimal. Cans are designed to handle the small pressure variations that occur during ground travel, so rupture is rare on a car trip.

Frequently Asked Questions

Can I pack cans in my carry-on bag instead of checked luggage?

No. TSA rules prohibit all liquids and gels in carry-on bags, including beverages in cans. You can only bring empty cans through security, or you can purchase a sealed can after you pass through the checkpoint. Cans are allowed in checked baggage on most airlines, though rules vary.

Will a sealed can of soda definitely rupture if I fly with it?

No. Many people fly with cans in checked bags without problems. Rupture happens when pressure and temperature changes combine with a weakness in the can — a dent, a manufacturing flaw, or carbonation that is already at high pressure. A perfect can may survive the flight, but the risk is real enough that packing cans is not recommended unless you are willing to accept potential damage.

Are glass bottles safer than cans in checked luggage?

Yes. Glass is rigid and does not deform under pressure, so it is much less likely to rupture. However, glass bottles can break if your bag is dropped or crushed during handling. Wrap glass bottles in bubble wrap or clothing to protect them from impact damage.

What if I pack a can in a sealed plastic bag — will that prevent rupture?

No. A plastic bag will not prevent the can from rupturing because the pressure inside the can is still higher than the external pressure. A plastic bag will only contain the spill if the can does rupture, protecting your other belongings. It will not stop the rupture from happening.

Can I pack cans if I wrap them in clothes or towels?

Wrapping cans in soft items helps protect them from impact damage and provides some cushioning, but it does not prevent rupture from pressure changes. Soft packing reduces the risk of dents that could weaken the can, but it is not a complete solution. Rupture from pressure change can still occur even if the can is well-padded.