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 payload for English Language Learners. : 1  the amount of goods or material that is carried by a vehicle (such as a truck) : 2  the things (such as passengers or bombs) that are carried by an aircraft or spacecraft. : 3  the weight of a payload.