Multifunctional backpack

The multifunctional knapsack comprises a knapsack body, shoulder straps and a waistband, an indicator light containing bag is arranged on the upper side of the front face of the knapsack body and comprises a protective surface layer, a middle interlayer, a containing bottom layer and a first elastic band, the containing bottom layer is fixed to the front face of the knapsack body, and a containing bag opening is formed in the containing bottom layer; the lower end of the protective surface layer is fixed to the storage bottom layer, the left end, the right end and the upper end of the protective surface layer are sewn to the storage bottom layer through zippers, the middle interlayer is fixed to the front face of the storage bottom layer, and a rectangular opening is formed in the middle of the middle interlayer. The two groups of first elastic belts are arranged and are correspondingly arranged between the middle interlayer and the storage bottom layer, and the bicycle saddle has the advantages that the bicy