另外，背外架包坐公共交通很不方便。
In addition, the back frame packet sit public transportation is not very convenient.
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.
如果你经常去的地方比较平坦开阔，大背包可以选择外架包。
If you often go to the place is relatively flat and open, backpack can choose the frame packet.
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