Southwest Airlines allows one personal item and one standard carry-on bag per passenger, both free of charge. Carry-ons must fit under the seat or in the overhead bin and comply with size limits. Prohibited items include firearms, flammable liquids, and sharp objects larger than 4 inches.
Southwest's baggage policy prioritizes flexibility. Unlike many carriers, it doesn't charge for checked bags. Passengers may bring one carry-on and one personal item at no cost. This includes items like laptops, strollers, and medical equipment. The airline enforces size limits to ensure cabin space remains usable during boarding and flight.
Passengers often misunderstand what counts as a personal item. A tote bag, laptop case, or small backpack qualifies if it fits under the seat in front of you. Larger bags, such as duffel bags or rolling suitcases, don't qualify unless they're carried to a personal item. Southwest does not allow oversized bags in the cabin unless purchased as a premium option.
Southwest defines a standard carry-on as no larger than 22 x 14 x 9 inches (56 x 36 x 23 cm). This includes handles and wheels. The bag must fit in the overhead bin or under the seat. Bags exceeding these dimensions are denied at the gate.
Airlines use a "gate check" process for oversized bags. If your carry-on exceeds size limits, Southwest staff will ask you to check it at the gate. You'll receive a claim tag and retrieve it at your destination. Gate-checked bags are not subject to fees, but they're not likely to arrive on time.
For reference, a typical 24-inch rolling suitcase exceeds Southwest's carry-on limit. A 16-inch laptop bag fits under the seat. Always measure your bag before arriving at the airport. Southwest's size guidelines align with FAA standards for cabin storage, ensuring safety during turbulence and emergency evacuations.
A personal item must fit under the seat in front of you. Examples include a small backpack, a purse, a laptop bag, or a diaper bag. If your personal item is too large, it may be rejected at the security checkpoint or boarding gate.
Common errors include bringing a large tote bag labeled "personal item" or using a duffel bag as both a carry-on and personal item. These bags often exceed the 18 x 14 x 8 inch (46 x 36 x 20 cm) maximum footprint. Even if the bag fits under the seat, it may block access for adjacent passengers.
I once saw a traveler attempt to board with a 20-inch rolling backpack as their personal item. It blocked the aisle and required removal. Southwest staff politely asked the passenger to check it. The bag was gate-checked without fee, but the delay caused missed connections. Always verify your personal item fits under the seat before reaching the gate.
Southwest prohibits weapons, explosives, flammable materials, and hazardous substances. This includes aerosol cans, lighters, and fuel containers. Sharp objects longer than 4 inches (10 cm) are not allowed in carry-ons. Knives, scissors, and tools must be checked or left behind.
Alcohol is restricted to 5 liters per passenger in checked bags. Liquids in carry-ons must follow TSA's 3-1-1 rule: each container ≤ 3.4 oz (100 ml), all in one clear quart-sized bag. Alcohol over 140 proof requires special handling and cannot be carried on.
Medical devices like insulin pumps and oxygen concentrators are permitted. Passengers should inform staff at check-in. Medications in original packaging are allowed. Always carry prescriptions for controlled substances. Southwest does not allow pets in cabins except service animals.
| Item Type | Allowed? | Notes |
|---|---|---|
| Laptop | Yes | Must be removed for screening |
| Small backpack | Yes | Counts as personal item |
| Rolling suitcase (24 in) | No | Exceeds carry-on size |
| Scissors (6 in) | No | Over 4 in; must be checked |
| 12 oz bottle of water | Yes | After security; not in carry-on |
Many travelers assume a personal item is optional. It's not. Southwest allows one personal item and one carry-on. Both are free. You cannot bring two carry-ons without paying extra.
Some believe a large tote bag qualifies as a carry-on. It does not. If the bag exceeds 22 x 14 x 9 inches, it's treated as a carry-on. If it's smaller but still too wide or tall, it may be rejected. Always measure your bag before leaving home.
Another misconception is that all bags can be checked at the gate. No. Southwest only gates checks bags that exceed carry-on size. If your bag is within limits, you must carry it on. There is no "check at gate" option for compliant bags.
Consider a business traveler flying from Dallas to San Diego. They pack:
The roller bag holds clothes, toiletries, and a tablet. The backpack contains a laptop, charger, and documents. Both items meet Southwest's requirements. No fees apply. The traveler boards without issue.
Now consider a family of four traveling with two children. Each adult brings a carry-on and personal item. The children bring only personal items: small backpacks. All bags fit. No additional charges. Southwest's policy supports families and solo travelers equally.
Understanding southwest what can I bring ensures a smoother process. Know your limits. Measure your bags. Avoid gate checks. Bring only what fits. This prevents delays and keeps your trip on schedule.