Dog Bags for Travel: How to Choose an Airline-Ready Carrier and Pack the Right Gear

Dog bags for travel are purpose-built carriers, kennels and gear bags that keep a dog contained, ventilated and identifiable on planes, trains and road trips. For flying in the cabin, choose a soft-sided, leak-proof carrier no larger than about 18 x 11 x 11 inches, which is the size American Airlines and Delta Air Lines both recommend. It needs mesh ventilation on several sides and enough room for your dog to turn around. Pack a leash, food, water and the entry documents your destination requires.

As of September 2026, airline size limits, fees and government entry rules change often, so this guide names the organization behind every rule and links to the primary source. It covers how to choose the bag. The paperwork that goes inside it is covered separately in the Animal Passport blog.

What counts as a dog travel bag?

A dog travel bag can mean four different things. Most confusion comes from mixing them up:

• Soft-sided in-cabin carrier: a padded, zippered bag with mesh panels that fits under the seat in front of you. Airlines recommend this type for small dogs flying in the cabin.
• Hard-sided in-cabin kennel: a rigid plastic carrier. It is allowed on many flights but has stricter size limits because it cannot compress.
• Rigid checked or cargo kennel: a crate built to air-freight standards for dogs too large for the cabin.
• Dog gear bag or tote: a separate bag for food, bowls, waste bags, leash and documents. On a plane it usually counts as your one other item.

Backpack-style and sling carriers are popular for walking around cities. On a plane, though, they must meet the same under-seat, closure and ventilation rules as any other in-cabin carrier.

Airline carrier size rules at a glance

Published limits are fleet-wide maximums, not a promise for every seat. Delta Air Lines states in its agency pet policy that maximum carry-on kennel dimensions are determined by the aircraft type. It recommends a soft-sided kennel of up to 18 x 11 x 11 inches because that size fits most aircraft.

Sources: American Airlines pets page and Delta Air Lines agency pet policies, both checked in September 2026. Always confirm with the airline for your specific flight and aircraft.

Where the sources disagree

The airlines do not agree on ventilation. American Airlines requires soft-sided carriers to have nylon mesh ventilation on 3 or more sides. Delta Air Lines' agency policy says in-cabin kennels, soft or hard, must be ventilated on at least two sides. If you fly both airlines, buy a bag with mesh on three or four sides so it meets the stricter rule.

Weight and seat restrictions

Most in-cabin rules focus on dimensions, but some aircraft also cap weight. American Airlines says the combined weight of pet and carrier must not exceed 20 pounds (9.07 kg) in the dedicated pet compartments on its three-cabin Airbus A321T. The airline also bars carry-on pets from bulkhead and exit-row seats. Delta Air Lines likewise bars pets from bulkhead, exit-row and flat-bed seats.

Features that make a dog carrier airline-ready

Read together, the airline policies point to a short list of features to look for:

1. Fit: Delta Air Lines says your dog must fit comfortably without touching or protruding from the sides and must be able to move around. American Airlines says the pet must fit comfortably inside the closed, zipped carrier.
2. Flexibility: According to American Airlines, soft-sided collapsible kennels may be slightly larger than the listed size. They must still fit under the seat without being collapsed excessively.
3. Leak-proof base: Delta Air Lines requires in-cabin kennels to be leak-proof. A removable absorbent pad helps on long days.
4. Secure closures: Delta Air Lines requires the kennel door to stay secured in the boarding area, in its lounges and on board, so zippers that lock or clip are worth paying for.
5. Ventilation: Choose mesh on at least three sides to satisfy the American Airlines rule.
6. Padding and water-repellent fabric: American Airlines lists both as requirements for soft-sided carriers.

How many bags can you bring with a dog on board?

The carrier counts as one of your items. American Airlines allows one additional item with a pet carrier: either a personal item or a carry-on that fits in the overhead bin, not both. Delta Air Lines similarly allows one carry-on or one personal item in addition to the pet kennel. So plan for your dog's gear bag to be your only other item, or pack the dog supplies inside your own carry-on.

Fees are separate from bag rules. American Airlines lists a carry-on pet fee of $150 per kennel, each way, within and between the United States and Canada, Mexico, Central America and the Caribbean, as of September 2026. American Airlines also says pet strollers must be checked at the ticket counter and that checked bag fees apply.

Getting through airport security with a dog bag

The Transportation Security Administration (TSA) screens the bag and the dog separately. On its official FAQ, TSA tells travelers to remove the pet from the carrying case, put the case through the X-ray machine and keep the pet under control with a leash. The leash should come off while you carry the pet through the metal detector. TSA adds that animal carriers undergo a visual and/or physical inspection.

1. Arrive with your dog inside a hand-held travel carrier.
2. Take the dog out just before screening starts, with a harness and leash already on.
3. Place the empty carrier on the belt for X-ray. Never put the dog in the X-ray tunnel.
4. Carry your dog through the metal detector, or walk it through on a leash if the officer directs.
5. Return the dog to the carrier in the re-composure area, away from the checkpoint.

Steps 1 to 5 follow TSA's published checkpoint guidance, including its December 2022 press release for Denver International Airport, which also notes that an officer will swab the owner's hands for explosive trace residue. Because the dog has to come out of the bag, a well-fitted harness matters as much as the carrier itself.

Checked and cargo kennels: a different kind of dog travel bag

If your dog is too big for the cabin, a soft bag will not work. Access is also limited. American Airlines and Delta Air Lines both accept checked pets only for active-duty U.S. military and U.S. State Department Foreign Service personnel traveling on official orders. Other large dogs usually travel through the airline's cargo service.

The kennel standard for checked pets and cargo is strict. American Airlines requires kennels that:

• let the dog stand, turn, sit and lie down without touching the sides or top
• weigh no more than 100 lbs (45 kg) combined with the pet
• have a welded or cast metal door
• have ventilation on at least 3 sides for domestic U.S. travel and 4 sides for international travel
• have food and water dishes attached securely inside

The IATA container size formula

The International Air Transport Association (IATA) gives a formula for the minimum internal size of an air-travel container, based on four measurements of your dog:

• A: nose to base of tail
• B: ground to elbow
• C: width across the shoulders
• D: standing height to the top of the head or ear tip

Container length = A + half of B. Width = C x 2. Height = D plus bedding. IATA says snub-nosed breeds need a container 10% larger. IATA's detailed Container Requirement 1 for cats and dogs is published in its 2026 Live Animals Regulations.

What to pack in your dog's travel gear bag

Official sources say little about bag brands, but they are specific about what must travel with the dog. A practical packing list based on those rules:

• Two forms of ID on the collar: IATA recommends a permanent ID tag with your name, home address and phone number, plus a temporary travel tag with a contact at your destination. It also recommends microchip identification.
• Leash and harness: needed at the TSA checkpoint.
• Food and water: IATA recommends reducing food the day before travel while still giving enough water. For checked pets, American Airlines requires a small bag of food for 24 hours attached to the kennel.
• Absorbent liner: American Airlines requires absorbent material in checked kennels and does not allow straw, hay or wood shavings. A liner is also sensible in an in-cabin bag.
• Documents, in paper and on your phone: for U.S. entry, the Centers for Disease Control and Prevention (CDC) says the CDC Dog Import Form receipt can be printed or shown on your phone. The CDC also recommends having copies of medical records available if your dog does not appear healthy on arrival.

Do not pack sedatives unless a veterinarian prescribes them for a medical reason. IATA discourages sedating pets in transit. American Airlines says it does not accept pets that have been sedated or tranquilized, following American Veterinary Medical Association (AVMA) recommendations.

Travel documents that belong in the bag

The bag gets your dog on board. Documents get your dog across the border. These are official government schemes, and requirements depend on where you are going.

Entering or returning to the United States

The Centers for Disease Control and Prevention (CDC) is the primary authority for dog imports, according to the United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) pet travel page, last modified March 2026. The CDC states that every dog entering the U.S. needs a CDC Dog Import Form receipt. The dog must also appear healthy, be at least 6 months old and have a microchip readable by a universal scanner. The CDC updated the form's web system on February 5, 2026, and says importation requirements did not change. Dogs that have been in a high-risk country for rabies need additional documents.

Traveling to or within the European Union

The European Union's Your Europe portal says a dog travelling between EU countries needs three things: a microchip, a rabies vaccination given after microchipping, and a valid European pet passport. The pet passport is issued only to owners resident in the EU. Travelers from outside the EU need an EU animal health certificate instead, issued by an official state vet no more than 10 days before arrival. For dogs going to Finland, Ireland, Malta, Norway or Northern Ireland, a tapeworm (Echinococcus multilocularis) treatment is required 24 to 120 hours before travel. The European Commission says intra-EU pet travel rules are now set out in Commission Delegated Regulation (EU) 2026/131.

Traveling from Great Britain

The UK government (GOV.UK) says residents of England, Scotland or Wales cannot use a pet passport to enter the EU. They need a new animal health certificate from a vet for each trip. It is valid for 10 days for entry into the EU and 6 months for onward travel and re-entry to Great Britain.

Animal Passport is not an EU pet passport

The word passport causes confusion, so here is the distinction. The EU pet passport, the EU animal health certificate and the CDC Dog Import Form are official documents set by governments. Animal Passport is a different product: a digital animal and livestock identity record built on muzzle biometrics. An animal's nose print is unique, like a fingerprint.

With Animal Passport, a phone captures the nose print. The record binds the owner, breed, estimated age, body condition and vaccination history. Age is estimated from a dental photograph with a confidence score, and body condition is scored from 1 to 5 using a side-profile photo. In August 2025 it was used in livestock flood rescue in Pakistan, so farmers could reclaim animals after paper tags washed away.

Animal Passport does not replace a microchip, an EU pet passport, a health certificate or any airline requirement. It is not a government-issued travel document, and it does not provide veterinary diagnosis or legal advice. For border crossings, follow the official scheme for your destination.

How to choose a dog bag for travel: 6 steps

1. Check your airline and aircraft: look up the published carrier limit, then confirm by phone for regional jets. American Eagle's hard-sided limit is smaller than American Airlines mainline.
2. Measure your dog: use the IATA A, B, C and D measurements, even for a cabin bag, so the dog can stand and turn around.
3. Pick soft-sided for the cabin: both American Airlines and Delta Air Lines recommend soft-sided carriers.
4. Check ventilation and base: mesh on three or more sides, a leak-proof floor and lockable zippers.
5. Plan your one extra item: make the gear bag your personal item or pack supplies inside your carry-on.
6. Crate-train early: IATA advises getting your dog used to its crate a few weeks or months before departure.

For more guides on animal identification and travel records, visit the Animal Passport blog.

By Animal Passport. Last updated September 29, 2026. Rules are summarized from the official sources listed below; confirm with your airline and destination authority before you travel.