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What is "Backpack" - Definition & Explanation

It made from many varieties of fabric. However, it is typically made of a sturdy fabric to provide proper support for carrying items. Often used be students to carry books. Apparel Search viewers are often found carrying heavy back packs full of fashion magazines, scissors, fabric and thread. A camping pack, as of canvas or nylon, supported by usually aluminum frame and carried on the back.
The simplest form of backpack (also rucksack or knapsack) is a cloth sack carried on one's back and secured with two straps that go over the shoulders and below the armpits. The shoulder is better suited for bearing heavy weights for long periods of time than the hand, so backpacks are often used for that purpose.

Some other terms

Some more terms:

The generic name for fibres made from a synthetic linear polymer of ethylene and that has the structure: NOTE: The two types of commercial production are: a) high-density polyethylene *HDPE),...
A manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of acrylonitrile units [-CH2-CH(CN)-] (FTC definition). Acrylic...
A group of units of products of the same type, structure, colour and finish, class and composition, manufactured under essentially the same conditions and essentially at the same time, and submitted...
A yarn that is spun using pre-dyed fibers. These fibers are blended together to give a particular look. (For example, black and white may be blended together to create a grey heathered yarn.) The...
The quantity of heat absorbed or released by a substance undergoing a change of state, such as ice changing to water or water to steam, at constant temperature and pressure. When a solid material is...

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