You can mail soda cans through USPS, FedEx, and UPS. Carbonated beverages aren’t classified as hazardous, so no carrier bans them, but mailing soda cans triggers packaging rules that most everyday shipments don’t have to worry about. USPS treats them as mailable “without restriction” only when they’re packaged according to the Domestic Mail Manual, which for any pull-tab metal container over 4 fluid ounces means a three-layer system. Skip those steps and a burst can becomes your financial problem, not the carrier’s.
How to Package Soda Cans for Shipping
DMM Section 601.3.4 sets a triple-packaging standard for pull-tab metal containers holding more than 4 fluid ounces.1Postal Explorer. DMM 601 Mailability Every can needs all three layers.
- Absorbent cushioning around each can. Enough to soak up the entire contents if the can ruptures. Bubble wrap alone doesn’t qualify; use paper towels, cellulose wadding, or similar absorbent material, with bubble wrap on top for shock protection.
- A sealed, leak-proof inner container. Place each wrapped can inside a zip-top plastic bag or a sealed plastic container so any leak can’t reach the outer box.
- A sturdy corrugated outer box. Use dividers or padding to keep cans off each other and off the box walls, and fill empty space with peanuts or crumpled paper so nothing shifts.
Seal every seam of the outer box with strong packing tape. A 12-pack of soda runs about 10 pounds, and the box bottom is the most common failure point. For a full case, use a box rated for at least 32 ECT (edge crush test), which is printed on the bottom flap of most shipping boxes.
Mark the outside of the package to show it contains liquid, and add orientation arrows so handlers keep it upright.1Postal Explorer. DMM 601 Mailability
USPS, FedEx, and UPS Rules
USPS Publication 52 states that carbonated beverages are “not regulated as hazardous materials and are mailable without restriction but must be properly packaged in accordance with DMM 601.”2Postal Explorer. 342 Gases (Hazard Class 2) “Without restriction” is the key phrase: soda can travel on any USPS service, including Priority Mail, Priority Mail Express, and USPS Ground Advantage. Nothing forces it onto ground-only transport.
FedEx accepts non-hazardous liquids and recommends watertight plastic containers with closures taped shut so vibration during transit doesn’t loosen them. FedEx also requires absorbent material inside the package, such as paper towels or moisture-absorbing packets, and states that proper packaging is entirely the shipper’s responsibility.3FedEx. How to Ship Non-Hazardous, Non-Dangerous Liquids
UPS also permits liquid shipments when they’re properly packaged, though its published guidance is less detailed. The same layered approach — absorbent material, sealed leak-proof inner container, sturdy outer box — satisfies all three carriers. Ground services are the safer choice for carbonated drinks on any carrier, since pressure changes at altitude stress sealed containers, though no carrier explicitly bans soda from air transport.
Freezing and Heat Can Burst Cans
The carbon dioxide dissolved in soda creates internal pressure that rises with heat and agitation. Cans jostling in a delivery truck are essentially being shaken, which is part of why containment matters. Temperature is the risk most shippers underestimate.
Soda freezes at roughly 30°F, and the liquid expands by up to 9% when it does. Sealed aluminum has nowhere to give, so pressure builds until the can bursts. Winter shipments, especially to northern states, can sit in an unheated truck or on a loading dock in sub-freezing weather for hours. Once temperatures stay below freezing for more than about an hour, the risk of rupture climbs sharply.
For cold-weather shipments, add insulating material like foam sheets or thermal bubble wrap inside the outer box. It won’t keep cans warm indefinitely, but it buys time during overnight lows. In extreme heat, internal pressure rises even without freezing, so summer shipments to hot climates carry their own risk, though cans are less likely to actually burst from heat alone than from freezing.
Which Service Costs Less
Soda is heavy for its size, which makes weight-based rates expensive. A six-pack of 12-ounce cans runs about 5 pounds before packaging. Priority Mail Cubic prices packages by volume and shipping zone instead of weight, provided each piece weighs 20 pounds or less and the longest side stays within 18 inches.4Postal Explorer. Domestic Mail Manual 223 Prices and Eligibility A compact box of soda fits that profile well and often costs significantly less than standard rates. Cubic pricing is available only to commercial mailers, so you’ll need a shipping platform such as PirateShip or Stamps.com; it’s not offered at the post office counter.
USPS Ground Advantage is the budget option for non-urgent shipments, with delivery in 2–5 business days.5Postal Explorer. Minimum and Maximum Sizes FedEx Ground and UPS Ground run similar timelines. Get a tracking number regardless of carrier. Liquid shipments are the ones you most want to watch, because a delay in a warehouse during a cold snap can turn a well-packed box into a soggy one.
What You Owe if a Can Leaks
This is the part casual shippers skip, and it’s where money is actually at stake. USPS Publication 52 warns that improperly packaged liquids “present a higher risk of causing damage to other mail and Postal Service equipment.”6Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail If your leaking soda destroys another shipper’s package, the damage can come back to you.
Mailers who don’t follow the packaging rules and cause damage may face liability under federal law, with Publication 52 pointing to 39 U.S.C. § 3018 and 18 U.S.C. § 1716.6Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail Because soda itself isn’t hazardous, criminal exposure for a leaky can is unlikely. Civil liability for damage to nearby packages is a real possibility if your packaging clearly didn’t meet DMM 601.
Insurance adds another catch. Carrier insurance and declared value coverage assume the package was prepared properly. If a claim investigation shows your soda wasn’t triple-packaged, the carrier has grounds to deny the claim. The same reasoning applies to damage your leak causes to neighboring packages: the other shipper’s claim may be paid, and the carrier may then seek reimbursement from you. On any shipment of real value, careful packaging is cheap next to that exposure.