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 sack. 1 : a usually rectangular-shaped bag (as of paper, burlap, or canvas) 2 : the amount contained in a sack; especially : a fixed amount of a commodity used as a unit of measure. 3a : a woman's loose-fitting dressb : a short usually loose-fitting coat for women and childrenc : sacque 2. 4 : dismissal gave him the sack.