Abstract: A support bag for a knapsack is provided, which is fixedly connected to a shoulder strap of the knapsack using two hooks provided at upper and lower ends of a rear side thereof and is located in a position that corresponds to a user's chest to securely store valuables therein. The support bag includes a bag body having a reception space and a “”-shaped zipper member provided on an edge portion thereof, a first hook provided at a lower end of a rear side of the bag body, and a second hook provided at an upper end of the rear side of the bag body, and provided in a position biased toward the rear side from a vertical center line out of an upper end of an inner surface facing a user's chest to prevent shaking of the support bag in left and right directions.

Abstract: The present invention relates to a pouch for a backpack, which is to be connected and fixed to a side of the shoulder strap of a backpack so as to be positioned at the chest region of a user in order to enable the secure storage of valuables and other personal possessions, which has a storage space, the breadth of which progressively increases from top to bottom, and which is also capable of stably storing items by effectively supporting the center of gravity of an item stored therein due to being fastened to a backpack strap at the rear top and rear bottom thereof, respectively.