Definition of "backpack" []

• A knapsack, often mounted on a lightweight frame, that is worn on a person's back, as to carry camping supplies. (noun)
• A piece of equipment, often containing life-support devices, designed to be used while being carried on the back: a parachute in a backpack; an astronaut's backpack. (noun)
• To hike while carrying a backpack. (verb-intransitive)
• To carry in a backpack. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Actually, my backpack is a carry-on or “hand luggage”."
• "June 4th, 2010 at 7: 50 am drugs in backpack in: Science & Technology News"
• "No Daddy following you around to be sure your backpack is fully loaded."