Now, younger officers are in the backpack generation — throughout their school experience, they've had the pack, even more for the military veterans. Carrying a shoulder bag is not out of place in today's world.
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The general purpose of a backpack is to carry belongings wherever you go. In the military, this is necessary for long-term missions or any time you need to carry a lot of gear with you. Since this is what the backpack is designed for, it tends to have a larger capacity than other packs.