Color symbolism is the use of color as a representation or meaning of something that is usually specific to a particular culture or society. Context, culture and time are certainly important factors to consider when thinking about color symbolism.
Definition of backpack for English Language Learners. : a bag for carrying things that has two shoulder straps and is carried on the back.
A satchel is a bag with a shoulder strap. People often carry their books in a leather satchel. There are many types of luggage people use for carrying their belongings, such as suitcases, briefcases, purses, backpacks, and duffel bags. Another is the satchel, which is a small or medium-sized case with a flat bottom. A satchel usually has a shoulder strap which makes it easier to carry, and it's often full of books. The word satchel is related to sack, both coming from the Latin root saccus, or bag.