Best Pet Carriers for Travel 2026: Airline-Approved and Crash-Tested

Traveling with your dog should not feel like a gamble. Every year, owners reach the gate with a carrier that is the wrong size or the wrong format for their airline, and others put a dog on the back seat with no restraint and hope for the best. Both are avoidable if you choose the carrier for the trip you are actually taking.

We research rather than test: airline limits below come from each airline's own pet policy page, and crash results come from the Center for Pet Safety, all checked October 15, 2026. Here is what the airlines really require, which carriers fit each job, and where most people waste money.

Airline Rules: Know Before You Book

Every airline sets its own in-cabin carrier limits, and some vary them by aircraft. These are the current numbers from the four biggest US carriers.

Delta: Recommends a soft-sided carrier and checks that it fits fully under the seat in front of you. The carrier needs ventilation on three sides for domestic flights. Delta's $150 fee applies to tickets issued on or after April 8, 2025.

United: Pets travel in the cabin only; United no longer flies pets as checked cargo except for certain military and State Department travelers. If your flight is on a 737 MAX, the carrier cannot be taller than 10 inches.

American: Soft-sided carriers are recommended and can be slightly larger, but they still have to fit under the seat without being crushed. Hard-sided kennels have a tighter limit on American Eagle regional jets than on mainline aircraft.

Southwest: One carrier per ticketed passenger, holding up to two small cats or dogs of the same species. Southwest carries no pets in the cargo hold.

The universal rule is fit, not paperwork. Delta puts it best: your dog must be able to turn around in the carrier without touching or pushing against its sides. If it can't, the carrier is too small, whatever the airline allows.

Rule of thumb: 18 x 11 x 11 inches clears Delta, United and American soft-sided limits. Southwest is the outlier at 10 inches tall.

How to Measure Your Dog for a Carrier

This is where most people mess up. You cannot eyeball this.

• Length: Measure from the tip of the nose to the base of the tail (not the tip). Add 2-3 inches.
• Height: Measure from the floor to the top of the head while standing. Add 2-3 inches for clearance.
• Width: Measure the widest point of the shoulders or hips. Add 2 inches.

Write these numbers down and compare them directly to the carrier's interior dimensions, not the exterior dimensions listed on the product page. A carrier that is 18" on the outside might only be 16.5" on the inside after accounting for walls, padding, and frame.

Soft-Sided vs Hard-Sided: The Real Trade-offs

Soft-sided carriers are the better choice for airline cabin travel. They give slightly to fit under tight seats, they weigh less, and the fabric walls flex when the dog shifts position. The Sherpa Original Deluxe remains the default here. Its patented spring-wire frame lets the rear of the carrier push down several inches to fit under an airplane seat, and Sherpa includes it in its Guaranteed On Board program.

One size note matters. The listing we link is the Large: 19 x 11.75 x 11.5 inches for pets up to 22 pounds. That is about an inch longer than the 18-inch limits above, which is exactly what the compressible rear is for, but if your dog fits the Medium, choose it for more under-seat margin.

Hard-sided kennels are the better tool for car travel when they are built and tested for it. A rigid shell is easier to clean and stacks securely in a cargo area, but the shell alone proves nothing about crash protection. Hard-sided cabin limits are also tighter: 17.5 x 12 x 9 inches on United.

My recommendation: if you fly and drive with the same small dog, own one of each. A soft-sided Sherpa for the cabin, and a crash-certified carrier or kennel for the car.

Car Safety: What the Crash Test Data Shows

An unrestrained dog is a hazard to itself and to everyone in the car during a hard stop. "Crash tested" printed on a box is a marketing phrase unless it names a protocol and a result.

The Center for Pet Safety (CPS) is the independent nonprofit that certifies pet travel products against published crash-test protocols, and it does not take manufacturer funding. Its certified list is short, which tells you how few products make the cut.

The carriers and kennels on this page with current CPS certification:

• Sleepypod Mobile Pet Bed -- Passed CPS certification testing in August 2024 with a 5-star rating, using a 15-pound test dog. It doubles as a bed at home, so your dog already knows it before travel day.
• Gunner Kennels G1 -- A roto-molded hard-sided kennel. CPS lists the Small, Medium and Intermediate sizes as certified; the Medium carries a 5-star rating. It is heavy to lift, cargo-area sized rather than cabin sized, and sold direct by Gunner rather than on Amazon, so we link no listing for it.

A fold-flat crate is a different tool, and worth keeping straight. The Amazon Basics Portable Folding Soft Dog Crate (29.92 x 21.3 x 21.3 in in the Medium) sets up without tools, collapses into the trunk, and is what you want for containing a dog in a hotel room, a rental, or at a campsite. It has not been crash-tested by anyone, so do not use it as a restraint while the car is moving -- buckle the dog into a tested harness or a tested carrier, and save the folding crate for the destination.

Whatever you use, secure it so it cannot slide or shift in a sudden stop, which is the ASPCA's core road-trip advice. A rear-seat cover protects upholstery but restrains nothing, and our road-trip safety plan covers restraint, packing and stops in one place.

Backpack Carriers for Hiking

Backpack carriers have exploded in popularity, and for good reason. If you have a small dog, a senior with limited stamina, or a puppy that is not yet conditioned for long trails, a backpack lets them join the hike without overexertion.

Best Overall: Kurgo G-Train Dog Carrier Backpack. Kurgo rates it for dogs up to 25 pounds. The supportive hip belt and ventilated back panel spread the load on longer hikes, the waterproof base protects against accidents, and roll-up mesh windows keep air moving. It even has a padded laptop sleeve for commuting. It is a trail and commuter pack, not a cabin carrier.

Best Budget: PetAmi Expandable Pet Carrier Backpack. Under $50 for pets up to 18 pounds. The back panel expands to give your dog more room at rest stops, an internal safety leash stops jumping out, and reflective straps help on evening walks. PetAmi markets it as airline approved, but its interior alone is 16.3 inches tall, taller than every under-seat limit in the table above, so treat it as a walking pack.

A word of caution: do not hike with a loaded backpack carrier until you have tried it on a short walk first. The weight distribution changes when a 20-pound dog shifts its body weight, and you need to know how your balance is affected before hitting a real trail.

For budget-conscious shoppers, check out our pet gear budget guide to see where carriers fall on the save-vs-splurge spectrum. And if you need a harness that works with your carrier's tether, our harness roundup covers compatible options. Planning the whole trip? Start with the travel planning guide.

The Bottom Line

For airline cabin travel, the Sherpa Original Deluxe is the safest bet: the spring-wire rear squeezes under tight seats and Sherpa backs it with its Guaranteed On Board program. For car travel, the Sleepypod Mobile Pet Bed is the CPS-certified 5-star soft carrier for pets up to 15 pounds. For hiking, the Kurgo G-Train justifies its price for dogs up to 25 pounds. Stop guessing at dimensions, check your airline's own page, and stop driving with an unrestrained dog. The right carrier is not optional gear -- it is safety equipment.

🏆 Bottom Line: Sherpa Original Deluxe for the cabin, Sleepypod Mobile Pet Bed↗ for the car, Kurgo G-Train for the trail. Airline limits change, so recheck yours before you book.

Related Reading

• Travel & Carriers — Airline-approved carriers and travel gear
• Leashes & Collars — Travel-safe harnesses and leashes
• Dog Health — Calming products for travel anxiety