day pack

基本解釋

You will need to have good hiking boots, a day pack, raincoat, lunch, water, personal first aid kit and a back up torch.
你需要有一雙良好的登山鞋、背包、雨衣、午餐，水、急救箱和備用電筒（估計要防水的）。
blog.sina.com.cn
This 50-liter travel pack includes a removable day pack that's hydration ready for rigorous trails and a variety of outdoor activities.
這50升的旅行裝包括一個可移動的一天包的水化嚴格的小徑和各種戶外活動的準備。
The other item you always feel is your day pack, so I am very lucky to have an assortment of Salomon packs that fit great and allow me to run and hike in comfort.
另外一個很重要的東西是擬定背包，所以，我非常幸運的擁有一個很貼身能讓我舒舒服服奔跑和步行的所羅門的背包。

We meet,we talk about what the hike is for the day, and then they pack their backpacks and we head out the door - no matter what the weather."
Soldiers were expected to be able travel thirty kilometers per day, in full pack.
士兵一天可以行進30千米，在全副裝備的情況下。
耶魯公開課 - 新約課程節(jié)選

But, as I'm learning on this three-day pack trip into northwest Yellowstone National Park, the opposite is true: I have no idea how to ride.
FORBES: Magazine Article
The former two pack a day smoker says cigarettes didn't affect her vocal cords and neither did six husbands.
NPR: The Most Captivating Voice in the World