这种背包通常结构比较简单，不设外挂或较少设外挂，除一个主袋外，通常设3 - 5个附袋，便于分类装载物品。

This backpack is usually relatively simple structure, no plug-ins or plug-in for less, with the exception of a main bag, usually a 3-5 attached bag for carrying goods classification.

youdao

这种背包通常结构比较简单，不设外挂或较少设外挂，除一个主袋外，通常设3 - 5个附袋，便于分类装载物品。

This backpack is usually relatively simple structure, no plug-ins or plug-in for less, with the exception of a main bag, usually a 3-5 attached bag for carrying goods classification.

youdao