bivvy sack
noun [ C ] UK (US bivy sack) uk/ˈbɪv.i ˌsæk/ us/ˈbɪv.i ˌsæk/ (informal bivvy)
（套在睡袋外面以增加保护的）露宿袋，露营睡袋
a thin, light cover that fits over a sleeping bag for extra protection, often used by climbers
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