What's the difference between daypack and haversack?

Daypack

Definition:

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Haversack

Definition:

• (n.) A bag for oats or oatmeal.
• (n.) A bag or case, usually of stout cloth, in which a soldier carries his rations when on a march; -- distinguished from knapsack.
• (n.) A gunner's case or bag used carry cartridges from the ammunition chest to the piece in loading.

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