Backpacks are sometimes used as luggage, particularly as carry-on bags for airplane travel.

Six carry-on bags rode in the stretch limousine that the cruise line sent to pick us up on the afternoon of Jan. 19.

Because of this, the airline allowed each passenger to take up to two carry-on bags.

These kinds of sharp instruments are now found in about one in four carry-on bags.

Because the holds of the planes are reserved for textiles, express mail, machine tool parts and other cargo, passengers may bring only two carry-on bags.

We want to rent a minivan (Ford Aerostar size) to hold four suitcases and four carry-on bags.

His briefcase, holding the contraband, was indistinguishable from anyone else's carry-on bag.

All carry-on bags, including purses, should be abandoned, which Ms. Marshall says is a hard lesson for people to learn.

For instance, after deplaning, Slater was able to run through secure zones near planes while towing two carry-on bags.

A few months ago, he said, an American employee flew four flights on a rival carrier, with three carry-on bags, "and he was never once challenged."