根据用途的不同，分为电脑双肩包、运动双肩包、双肩书包、束口绳包、军用背包、登山包等等。

According to different purposes, divided into computer bag, sports bag, backpack, bag, backpack beam rope, climbing bag and so on.

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这些<鸭子>的用途是，全是先前登山者陈设的，用以在这广大的山谷徘徊时节省脚程的。

The purpose of these ducks, as laid out by all previous climbers, was to save a mile or two of wandering around in the immense valley.

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