Frompack +‎sack.

packsack (pluralpacksacks)

1. (chiefly US) Abackpack,knapsack,rucksack or similarbag packed with provisions or personal items, especially as carried by atraveller or ahiker, and oftenslung over theshoulder.
   • 1899 November 19, “Deer Hunting in Minnesota”, inNew York Times, page12:

     The boy has a littlepacksack, in which he can carry twenty-five pounds for a short portage.

• “packsack”, inOneLook Dictionary Search.

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