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.
Definition of duffel. 1  1 : a coarse heavy woolen material with a thick nap. 2  2 : transportable personal belongings, equipment, and supplies. 3  3 : duffel bag.  4 : duffle coat.