New Carry-On Rules of 2026.
Until recently, whether your carry-on has stayed within the limits was often a game of chance. You might remember the old clunky metal sizers, where if you could shove your bag in with enough force, you were cleared for takeoff. Carry-on size restrictions were checked manually and often overlooked if the flight wasn't full.
However, in 2026 many airlines and airports have replaced the manual system with automated gate scanning. These scanners utilize AI-powered cameras that measure your bag’s volume in three dimensions as you walk through the boarding lane. Because of this precision, it is essential to follow every guideline to avoid friction at the gate.
What Size Can Your Carry-On Be in 2026?
In 2026, most airlines are maintaining the standard limit of 22 x 14 x 9 inches (56 x 36 x 23 cm). However, if your carry-on exceeds these measurements, the system automatically flags your boarding pass and you will most likely have to check your bag at the gate which can be an expensive and time-consuming affair.
The Total Dimension Rule.
Historically, many travelers relied on the 45-inch (115 cm) guideline, where the total sum of length, width and height was measured. Until 2026, many luggage manufacturers marketed bags based on the body size alone. Now, most airlines include both handles and wheels in their final measurements.
Measurements Including Handles and Wheels.
When selecting your carry-on, the focus has now shifted from finding the largest bag to finding the most efficient one. For your next trip you should focus on maximizing the internal volume while keeping the external silhouette within the scanner´s strict boundaries.
Read more: How big can a carry-on suitcase be?
Maximizing Your Under-Seat Personal Item.
Your personal item is generally a smaller backpack, tote bag or sling bag that can fit under the seat in front of you as an addition to your carry-on bag. In 2026, many airlines are more protective of the overhead bins than before. To maintain a seamless transit, your under-seat personal item should be approximately 17 x 10 x 9 inches (43 x 25 x 23 cm).
International Airline Restrictions of 2026.
International travel requires a mental shift from size to weight. While U.S. domestic flights are often more lenient, many international carriers in 2026 have tightened total cabin allowances to a strict 15.4 lbs (7 kg). This often covers the combined weight of your carry-on and personal item, making lightweight gear a necessity.
Avoid overweight fees and learn: How to stop overpacking.
Navigating the New Liquid Rules.
The “100 ml rule” is finally evolving at some airports where they are equipped with new 3D CT scanners that allow you to carry up to 2 liters of liquids and keep your electronics inside your bag. However, because this technology is not an universal technology, it is safer to stick to the traditional 100 ml rule in a clear zipper bag.
The 2026 Lithium Battery Protocol.
Safety regulations for power banks have reached a new level in 2026 to prevent cabin fires. Lithium batteries are strictly prohibited from checked bags and should always be in your carry-on. Many airlines also require these to be stored in your personal item under the seat rather than the overhead bin, and gate agents may want to verify factory markings to ensure they are certified. Another new rule is that charging your powerbank using in-seat power is prohibited.
2026 Travel Checklist: Carry-On Rules to Remember.
To ensure a seamless boarding experience, keep these updated 2026 regulations in mind before heading to the terminal:
- Respect the 3D scanners: Modern automated gate scanners measure your bag´s total exterior, so ensure your bag, including both handles and pockets does not exceed the standard 22 x 14 x 9 inch limit, and make sure to always check what the specific airline's restrictions are as they may differ.
- Watch the weight: Many airlines now strictly enforce a 15-22 lb (7–10 kg) weight limit for carry-ons.
- Strict lithium battery rules: Airlines now limit passengers to two portable batteries per person, which must be kept in your carry-on for easy inspection and never placed in checked luggage.
- Personal item compliance: Your second bag must fit entirely under the seat in front of you, as agents are increasingly flagging overstuffed personal items for additional fees.
- The advantage of flexibility: Utilize the flexibility of a soft sided carry-on to compress the bag into its most compact form before passing through digital boarding sensors.
Bringing More? Explore Our Luggage Collections.
Your Questions Answered.
What are the rules for liquids on planes in 2026?
The 3-1-1 rule is evolving as some major airports transition to CT scanners, allowing for up to 2 liters of liquids to remain inside your bag. However, because this technology is not available at every airport, the safest way to pack is to keep your 100 ml containers ready in a clear bag through security. In your checked luggage, you can pack larger liquid items.
What are the United Airlines and American Airlines carry-on restrictions?
For both United Airlines and American Airlines, their carry-on restrictions are 9 x 14 x 22 inches (23 x 35 x 56 cm) including both the handle and wheels.
What are the Allegiant Airlines carry-on restrictions?
For Allegiant Airlines, the carry-on bag can not exceed 10 x 16 x22 (25 cm x 40 cm x 56 cm) including external pockets, wheels and handles.
What are Spirit Airlines carry-on restrictions?
Spirit Airlines carry-on restrictions are 10 x 18 x 22 inches (25 x 46 x 56 cm) including handles and wheels.
