backpacks Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a bag carried by a strap on your back or shoulder;verb. hike with a knapsack Example Sentence We put our books and other school supplies in our backpacks. Synonyms knapsack; packsack; rucksack Antonyms hat Hear It! Say It! Write It! backpacks Switch to cursive Start Share with your friends: