Southwest Airlines Carry-On Policy | Size Limits, Personal Item Rules, and Packing Tips
Southwest Airlines keeps its carry-on policy simple and traveler-friendly: one carry-on bag and one personal item per passenger, at no extra charge under the official southwest airlines carry on bag policy. No other major U.S. airline includes both for free across every fare class. This comprehensive guide covers the official size limits, what qualifies as a personal item, and how to avoid an unexpected gate check.
Quick Answer: Southwest Carry-On Bag Policy Snapshot
Every passenger gets one free carry-on bag for the overhead bin and one free personal item for under the seat under the southwest airlines carry on bag policy. The carry-on has a strict size limit of 24″ × 16″ × 10″, while the personal item must fit completely under the seat in front of you under the southwest carry on size limit.
| Detail | What to Know |
|---|---|
| Free carry-on? | Yes, one per passenger, no fee under the southwest airlines carry on bag policy |
| Carry-on max size | 24″ × 16″ × 10″, including wheels, handles, and attachments |
| Free personal item? | Yes, one per passenger, at no extra charge |
| Personal item examples | Purse, crossbody bag, briefcase, laptop case, backpack, small camera, neck pillow, blanket |
| Weight limit | None stated, but you must be able to lift your bag into the overhead bin yourself |
| Pet carriers | Count as either your carry-on or your personal item |
| Best safe choice | A carry-on well under 24″ × 16″ × 10″ and a personal item that slides fully under the seat |
| Last verified | September 2026 (Official 2026 Southwest Policy) |
Official Policy Verification & Source Check
Official policy source: Southwest Airlines Help Center, “Carryon Baggage Policy” article (southwest.com)
Source type: Official airline website
Last checked: September 2026
Confidence level: High
Important notes: Partner airline itineraries may follow different carry-on and personal item rules. TSA rules on prohibited items are separate from Southwest’s own size and quantity policy.
How We Check This Policy: BagPolicyInfo builds each guide from the airline’s own official Help Center article first under the southwest airlines carry on bag policy, and flags anything that depends on a different source, like TSA rules or partner airline policies.
Official Southwest Carry-On Bag Policy Overview
Southwest allows one carry-on bag and one personal item onboard for every ticketed traveler under the official southwest airlines carry on bag policy:
Carry-On Bag Guidelines:
- Stowed in the overhead bin
- Size limit: 24″ (length) × 16″ (width) × 10″ (height) under the southwest carry on size limit
- Wheels, handles, and any attachments count toward these dimensions
- Examples: roller bag, small rolling suitcase, garment bag, duffel
Personal Item Guidelines:
- Must fit completely under the seat in front of you
- Examples: purse (including crossbody bags), briefcase, laptop case, backpack, small camera bag under the southwest airlines personal item rules
- Neck pillows and blankets do not count toward your carry-on allowance
What Makes This Southwest Policy Different
Most major U.S. airlines now charge for at least the first checked bag, and several also charge basic-economy passengers extra for a full-size carry-on. Southwest stands out in two key ways under the southwest airlines carry on bag policy:
- Two free items for everyone: A carry-on and a personal item are included on every fare class, with no restrictive “basic economy” penalties or gate surcharges.
- No weight limit stated: Southwest’s policy focuses strictly on dimensions and your ability to lift the bag yourself into the overhead compartment, rather than imposing a strict weight cap in pounds.
Allowed Bags and Size Limits Under Southwest Airlines Carry-On Bag Policy
Review the permitted bag types and requirements before heading to the airport:
| Bag Type | Cabin Status | Max Dimensions | Stowage Location & Rules |
|---|---|---|---|
| Standard Carry-On Bag | Allowed (1 Free) | 24″ × 16″ × 10″ | Overhead bin; must fit wheels and handles included |
| Personal Item (Purse / Laptop) | Allowed (1 Free) | Fits under seat | Under seat in front; backpacks, briefcases, purses allowed |
| Neck Pillows & Blankets | Exempt Extra | Standard travel size | Does not count toward carry-on allowance |
| Pet Carriers | Conditional | Airline approved | Counts as either your carry-on or personal item |
| Oversized Rolling Bags | Gate-Checked | Exceeds 24″ × 16″ × 10″ | Must be checked at ticket counter or gate |
Carry-On Bags
Roller bags and small suitcases are the typical carry-on. The limit is 24″ × 16″ × 10″, and that measurement includes wheels, handles, and any exterior attachments, so measure the bag as it will actually look when you board under the southwest carry on size limit.
Personal Items
A purse, crossbody bag, briefcase, laptop case, backpack, or small camera bag all qualify as a personal item under the southwest airlines personal item rules. Southwest does not publish specific dimensions for personal items, but it must fit completely under the seat in front of you.
Pet Carriers
If you’re traveling with a pet, the carrier counts as either your carry-on bag or your personal item, not as an extra item under the southwest airlines carry on bag policy.
Neck Pillows and Blankets
These are called out as exceptions: they don’t count toward your carry-on limit, so you can bring one in addition to your two free items.
Prohibited and Restricted Items
Southwest’s own baggage policy directs travelers to regulatory and airline safety resources for prohibited carry-on items:
- The TSA’s full list of prohibited carry-on items (firearms, sharp objects, tools over 7 inches)
- Southwest’s safety guidance on lithium batteries, portable chargers, power banks, e-cigarettes, and lighters (must remain in carry-on, never checked)
- TSA’s 3-1-1 liquids rule on liquids, aerosols, gels, creams, and pastes (3.4 oz or smaller per container)
How Gate and Bag Screening Works
If your bag is too large to carry on, or you’re bringing more than one carry-on and one personal item, you’ll need to check the extra item at the ticket counter before heading through airport security under the southwest airlines carry on bag policy. If a bag that seemed carry-on sized doesn’t fit once you’re boarding, it may need to be checked at the gate instead.
Packing Strategy for Faster Boarding
- Measure wheels and handles: Measure your carry-on against 24″ × 16″ × 10″, including wheels and handles, under the southwest carry on size limit.
- Keep personal item flat: Pack your personal item so it’s flat enough to slide fully under the seat without blocking foot space.
- Consolidate to two bags: Consolidate to two items before you reach the boarding gate, so you’re not sorting loose items on the jet bridge.
- Follow TSA liquids and battery rules: Keep power banks, vape devices, and your quart-sized liquids bag easily accessible.
- Count pet carriers properly: Keep a pet carrier as your one carry-on or personal item, not as a third bag under the southwest airlines carry on bag policy.
- Confirm partner connections: Confirm partner airline rules if any leg of your trip is on a different carrier.
Security Check Anxiety Tips
Southwest’s carry-on rules themselves are straightforward: two free items, sized to fit. Most travel anxiety comes from TSA security lines rather than the airline’s own policy. Arrive with plenty of time to spare, keep liquids and electronics ready for screening, and pack intentionally so you aren’t repacking in line.
Day-of Entry Tips From BagPolicyInfo
- Board according to your group position: Southwest uses open seating, and overhead bin space fills up as boarding groups proceed under the southwest airlines carry on bag policy.
- Gate-check early if needed: Gate-checking is complimentary if overhead space runs out, which can be faster than wrestling with an oversized bag on board.
- Pack a packable tote: Keep a small packable tote inside your personal item in case you need to remove essentials if your main roller bag is gate-checked.
Category-Specific Packing Tips
Business travelers: A laptop case or briefcase works well as your personal item, leaving your roller bag as the carry-on under the southwest airlines personal item rules.
Families with young kids: A diaper bag can serve as your personal item; pack a blanket or neck pillow separately since those don’t count against your limit.
Pet owners: Choose either a soft-sided pet carrier that fits under the seat (personal item) or one appropriately sized for the overhead bin (carry-on), depending on your pet and Southwest’s pet travel requirements.
Before You Go Checklist
- Carry-On Measured: Measured my carry-on (24″ × 16″ × 10″ or smaller, including wheels and handles) under the southwest carry on size limit
- Under-Seat Fit Confirmed: Confirmed my personal item fits under the seat in front of me
- TSA Rules Checked: Checked TSA rules for liquids, batteries, and restricted items
- Partner Flights Reviewed: Reviewed partner airline rules if part of my trip is on another carrier
- Gate Check Planned: Planned for possible gate check if traveling in later boarding positions
- Pillow & Blanket Separated: Packed neck pillow or blanket separately, since these don’t count toward the limit
Southwest Airlines Carry-On Bag Policy FAQs
How many bags can I bring on Southwest for free?
One carry-on bag and one personal item, both completely free on all fare types under the southwest airlines carry on bag policy.
What size is the Southwest carry-on limit?
The maximum size is 24″ × 16″ × 10″, including wheels, handles, and exterior attachments under the southwest carry on size limit.
Is there a size limit for personal items?
Southwest doesn’t publish specific numerical dimensions, but the item must fit completely under the seat in front of you under the southwest airlines personal item rules.
Is there a weight limit for carry-ons?
No weight limit is stated, but you must be physically able to lift the bag into the overhead bin yourself.
Does a pet carrier count as an extra bag?
No. A pet carrier counts as either your one carry-on bag or your one personal item under the southwest airlines carry on bag policy.
What happens if my bag doesn’t fit?
You can check it at the ticket counter before security, or gate agents will gate-check it during boarding if overhead bins are full.
Do neck pillows count toward my carry-on limit?
No. Neck pillows and blankets are specifically excluded from the two-bag count on Southwest flights.
Do partner airline flights follow the same rules?
Not necessarily. Partner airline itineraries may have different carry-on dimensions and personal item restrictions.
Related Bag Policies
Planning upcoming flights with other domestic or international carriers? Review our detailed baggage policy guides:
- Alaska Airlines Bag Policy Guide
- Hawaiian Airlines Baggage Policy Guide
- British Airways Baggage Policy Guide
- Aer Lingus Bag Policy Guide
- Icelandair Bag Policy Guide
Conclusion
Southwest’s carry-on policy remains one of the most generous in the airline industry: a free carry-on up to 24″ × 16″ × 10″ and a free personal item that fits under the seat, with no separate fare class penalties under the southwest airlines carry on bag policy and southwest carry on size limit. Measure your bags before leaving home, check TSA rules for liquids and batteries, and you’ll board smoothly without surprises.
Baggage policies can change without notice. Always confirm the current rules on the official Southwest Airlines website before your flight.
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