Carry on Bag Size Southwest Guidelines and Requirements

Southwest Airlines offers one of the most generous baggage policies in the aviation industry, allowing every passenger one carry on bag and one personal item at no extra cost. To ensure a smooth boarding process, you must adhere to the specific carry on bag size southwest dimensions of 24 by 16 by 10 inches. Selecting the right luggage allows you to bypass the ticket counter and move directly to your gate with confidence.

Official Carry on Bag Size Southwest Requirements

Southwest Airlines defines the maximum dimensions for a carry on bag as 24 inches long, 16 inches wide, and 10 inches high. These measurements must include all external parts of the luggage, such as wheels, retractable handles, and side pockets. If your bag exceeds these limits, ground crew members may require you to check the item at the gate.

For passengers looking to optimize their packing, a comparison of standard airline limits reveals that Southwest provides slightly more vertical space than many competitors. While most major carriers limit carry on height to 22 inches, Southwest allows for an additional 2 inches. This makes it an ideal airline for travelers who prefer larger duffel bags or specialized garment bags that might be rejected by other airlines.

In addition to the primary carry on, you are permitted one personal item. This item must be small enough to fit under the seat in front of you. Common personal items include purses, briefcases, or small backpacks. The standard dimensions for a personal item on Southwest are 18.5 by 13.5 by 8.5 inches. To help you prepare for your next trip, you can explore The Best Carry On Bags of 2025 to find a bag that fits these specific criteria perfectly.

How Strict Is Southwest About Carry On Size?

A common question among frequent flyers is how strict the airline actually is regarding these dimensions. Southwest uses metal bag sizers located at ticketing counters and boarding gates. If a gate agent suspects your bag is oversized, they will ask you to place it in the sizer. If the bag does not slide in easily, it will be tagged for the cargo hold.

The enforcement of carry on bag size southwest rules often depends on how full the flight is. On a completely booked flight, agents are much more likely to scrutinize bag sizes to ensure there is enough overhead bin space for everyone. If your bag is even one inch too big, it may fail the sizer test. This is particularly true for hard sided luggage which has no flexibility. Soft sided bags, like the Leather Duffel Bag priced at $130, are often more forgiving because they can be slightly compressed to fit into tight spaces.

Unlike some international budget carriers, Southwest does not currently enforce a strict weight limit for carry on luggage. The primary requirement is that you must be able to lift the bag into the overhead bin without assistance from flight attendants. This is a safety measure designed to prevent injuries to the crew and ensure a faster boarding process. However, checking American Airlines Carry On Luggage Size Requirements shows that different airlines have varying philosophies on weight, so always check if you have a connecting flight on a different carrier.

Can a 24 Inch Luggage Be a Carry On Southwest?

The answer is yes, provided the total height including wheels is exactly 24 inches or less. Many manufacturers sell bags marketed as 24 inch luggage, but these often refer only to the packing compartment. Once you add the height of the 360 degree spinner wheels and the top carry handle, the bag might actually measure 26 or 27 inches. This would make it ineligible for the overhead bin on a Southwest flight.

To be safe, you should always measure your bag from the floor to the very top of the handle. If your suitcase is exactly 24 inches, it will fit, but it will be a snug fit in the sizer. Most experienced Southwest travelers prefer bags that are slightly smaller, such as 22 inch options, to avoid any stress at the gate. If you are debating between different bag types, reviewing a Leather Duffel Bag vs Travel Bag 2.0 comparison can help you decide which style offers the best balance of capacity and compliance.

Can I Have a Backpack and a Carry On Southwest?

Yes, you can bring both a backpack and a larger carry on suitcase as long as the backpack qualifies as your personal item. This means the backpack must fit under the seat in front of you. A standard school sized backpack or a dedicated travel backpack like The Hoodie Backpack ($79) usually fits within the 18.5 by 13.5 by 8.5 inch personal item limit.

If you bring a large hiking backpack and a rolling suitcase, the crew will likely consider both to be carry on bags. Since you are only allowed one carry on for the overhead bin, you would be required to check one of them. For travelers who want to maximize their space without paying for checked bags, using a backpack as a personal item is the most efficient strategy. You can learn more about managing these two items in our guide on How to Organize a Carry On Bag effectively.

What if My Carry On Is One Inch Too Big?

If your luggage exceeds the carry on bag size southwest limit by just one inch, you are taking a risk. Hard shell suitcases are the most problematic in this scenario. If a hard shell bag is 11 inches deep instead of the allowed 10 inches, it simply will not fit into the metal sizer. Gate agents are trained to spot these discrepancies, especially on the Boeing 737 aircraft that Southwest flies, where bin space is precisely calculated.

Soft sided bags and duffels offer a significant advantage here. If your bag is slightly overstuffed, you can often rearrange the contents or compress the fabric to make it fit into the sizer or the overhead bin. This flexibility is why many frequent flyers choose leather or nylon bags over rigid plastic cases. For more information on how other airlines handle these minor size infractions, see our report on Carry On Luggage Size for Delta to see if they are more or less lenient than Southwest.

Choosing the Right Bag for Southwest Overhead Bins

When selecting luggage specifically for Southwest, you want to look for bags that maximize the 24x16x10 envelope. Many bags are designed for the more restrictive 22x14x9 limits of other airlines, which means you are leaving valuable packing space on the table. A bag that is closer to the Southwest maximum will allow you to pack for a week long trip without needing to check any luggage at all.

The Leather Duffel Bag is a prime example of a bag that utilizes this space well. Its soft structure allows it to expand to fill the bin while remaining easy to pull out when you land. If you prefer something more compact for shorter trips, the Luhxe 3 in 1 Tote Bag ($79.99) is an excellent choice for a personal item that can still hold a significant amount of gear. It is designed to be versatile, serving as a tote, a shoulder bag, or a backpack depending on your needs.

Tips for Securing Overhead Bin Space on Southwest

Since Southwest does not have assigned seating, your boarding position determines how much overhead space will be available when you step onto the plane. Passengers in the A group almost always find space directly above their seats. Those in the later C group may find that the bins are full, requiring them to gate check their carry on bag size southwest compliant luggage anyway.

To ensure you can keep your bag with you, consider these strategies:

• Check in exactly 24 hours before your flight to get the best possible boarding position.
• Purchase EarlyBird Check-In to automatically be checked in before the general public.
• Upgrade to Business Select for a guaranteed A1 through A15 boarding position.
• Travel with a soft sided bag that can be tucked into smaller gaps in the overhead bins.

If you do end up in a later boarding group, having a bag that can double as a personal item is a lifesaver. The The Hoodie Backpack can be placed under the seat if the bins are full, ensuring your essentials stay with you. For a deeper dive into the differences between these bag types, check our Carry-On vs. Personal Item: Luhxe Bag Size Comparison collection page.

Measuring Your Luggage Correctly

To avoid any surprises at the airport, use a tape measure at home. Place your bag against a wall and measure from the floor to the highest point. Then, measure the width across the widest part of the bag. Finally, measure the depth from the front to the back. When measuring depth, make sure the bag is packed as you intend to carry it, as overpacking can cause the sides to bulge and exceed the 10 inch limit.

According to the Transportation Security Administration, your packing choices also impact how quickly you move through security. Keep your electronics and liquids in an accessible part of your carry on bag size southwest compliant bag. Bags like the Leather Duffel Bag often have wide openings that make it easy to remove these items without unpacking your entire suitcase. For those who frequently fly with different airlines, comparing these rules to 7 Best Carry On Duffel Bag Options can provide a broader perspective on which luggage is the most versatile across the board.

Southwest Baggage Policy Summary

While the focus is often on the overhead bin, do not forget that Southwest still allows two checked bags for free on most fares, though some recent policy changes affect bookings made after May 2025. This means you do not have to struggle with a massive carry on if you do not want to. You can pack a smaller, more manageable carry on for your valuables and check a larger suitcase for your clothing and shoes.

A high quality travel bag is an investment in your comfort and peace of mind. Whether you choose the elegance of a Leather Duffel Bag or the practicality of The Hoodie Backpack, knowing that your gear meets the carry on bag size southwest requirements allows you to focus on your destination rather than your luggage. By following these guidelines and choosing the right equipment, you will be well prepared for any journey on Southwest Airlines.