Adjustable capacity-expanding backpack

The utility model relates to the field of knapsacks, and provides an adjustable capacity expansion knapsack which comprises a knapsack body, the knapsack body is a single-shoulder knapsack or a double-shoulder knapsack and is provided with at least one storage cavity, and the side edge of the storage cavity of the knapsack body is provided with an organ-type folding structure and a telescopic frame for adjusting the folding structure to stretch or contract and fold; the telescopic frame is telescopically arranged between the back inner side face and the front inner side face of the storage cavity. The organ type folding structure is arranged on the side face of the storage cavity of the backpack body, so that the storage cavity of the backpack can be expanded to increase the volume, and the storage cavity is contracted and folded when not used to reduce the volume of the backpack body, so that the backpack is convenient to place, and the purpose of expanding the capacity of the backpack body is achieved. And