Yes, duffel bags can be used as carry-on luggage. However, it is important to check the airline’s specific restrictions on carry-on luggage size and weight before you travel. The standard carry-on dimensions for most airlines are 22 x 14 x 9 inches (56 x 36 x 23 cm). The weight limit for carry-on luggage also varies by airline, but it is typically around 22-25 pounds.

If your duffel bag is larger than the standard carry-on dimensions, you may be able to bring it on board as a checked bag. However, you will need to pay a checked bag fee.

Here are some tips for using a duffel bag as a carry-on:

• Choose a duffel bag that is the right size for your needs. You don’t want to bring a duffel bag that is too big and bulky, as it may not be allowed as a carry-on.
• Pack your duffel bag efficiently. Make sure to pack the heaviest items at the bottom of the bag and the lightest items at the top. This will help to distribute the weight evenly and make the bag easier to carry.
• Use packing cubes to organize your belongings. This will help to keep your bag tidy and make it easier to find what you need.
• Be prepared to gate check your duffel bag. If your duffel bag is too large or heavy to be a carry-on, you may be asked to gate check it at the airport. This means that you will have to check your bag at the gate before you board the plane.