原先是日军驮运枪炮弹药的马背褡子,做得比较宽大,布料质地很好，缴获后就改制成了现在的模样。
O O O B-Organization I-Organization O O B-Thing I-Thing I-Thing I-Thing O B-Thing I-Thing I-Thing I-Thing O O O O O O O O B-Thing I-Thing O O O O O O O O O O O O O B-Time I-Time O O O O