1. [late 17C–18C] a sheep; used only in phr. napper of naps under napper n.1 [note napper’s poll n.].
2. [late 19C+] (Aus.) in senses of bed or covering [SE knapsack; but note SE nap, a short sleep].
(a) a sleeping bag.
(b) blankets or some other covering used by a sleeper in the open-air, a pack (as used in Northern Territory).