To make panier bags for a bicycle have functions to be carried on the back by easily removing the panier bags from the bicycle.

Zippers 14 are fitted to upper surfaces (surfaces that panier bags contact with each other when carrying the panier bags on the back) of the panier bags, and when carrying the panier bags on the back, stability of the panier bags is considered by connecting the panier bags with each other by the zippers 14. In the panier bags, variable type frames are incorporated, and the panier bags can be carried on the back by fitting shoulder belts by extending the frames when carrying the panier bags on the back.

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