男孩的包用英语可以称作 "boy's bag" 或 "boy's backpack."
"Bag" 是一个通用术语，指一种可以装东西的软袋或硬箱。"Backpack" 指一种可以挂在背上的包，常用于户外活动或旅行。
下面是一些英文例句及其中文翻译：
"The boy put his books and lunch in his backpack before going to school." (男孩在上学前把书和午餐装进他的背包。)
"She found her lost wallet in the bottom of her bag." (她在软袋底部找到了丢失的钱包。)
"He packed a change of clothes and a toothbrush in his backpack for his weekend camping trip." (他在背包里为周末野营之行准备了一套换洗的衣服和牙刷。)