JanSport is the world's largest backpack maker, and together, JanSport and The North Face, also owned by VF Corporation, sell nearly half of all small backpacks sold in the United States.
Backpacks are a standard part of the load-bearing equipment of soldiers, especially infantry, in most countries, and military-style packs are regularly available to civilians in military surplus stores.
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He also gives motivational speeches, using the analogy "What's in Your Backpack?" to extol the virtues of a life free of burdensome relationships with people as well as things.