首先，都市生活比较方便，可以买到比较多的商品，而且商店营业时间比较晚。
First, life in the city is more convenient. More goods are available and stores are open later.
双肩包的好处就在于携带比较方便，而且不需要用双手。
The backpack is good if more convenient to carry, and do not need to use both hands.
外架包价格不是很贵，而且填装背包也比较方便。
The outer frame package price is not very expensive, but also more convenient to fill backpacks.
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