To obtain a package for retaining freshness of vegetables and fruits, which has high preservative properties, makes an appearance excellent in the case of display at a store, produces less waste after use, and is friendly to the environment.

This bag-shaped package made of a porous material as a base material employs a material being at most 5 μm thich and having a polymer resin layer laminated thereon for the whole of the package or for at least part thereof. Accordingly, after sealing the bag-shaped package into which vegetables and fruits are put, the concentration of a carbon dioxide gas in the package can be made high as compared with that in ambient air, while the concentration of oxygen in the package can be made low as compared with that in ambient air, by the breath of the vegetables and fruits themselves of the contents.