Backpack for large objects

Abstract

A backpack for large objects is provided, which includes a main body, two straps, a first wing, a second wing, and an extended piece, wherein two ends of each of the straps are respectively connected to the rear of the main body, and the straps are used as shoulder straps. The main body has two opposite sides which are respectively connected to the first wing and the second wing, wherein the first wing and the second wing are connected to each other detachably. The first wing, the second wing, and the main body enclose and form a first holding space. The extended piece is connected to the main body close to either a bottom opening or a top opening of the first holding space.

What is claimed is: 
     
         1 . A backpack for large objects comprising a main body and two straps, wherein each of the two straps has two ends which are respectively connected to the rear of the main body, and the straps are used as shoulder straps, characterized in that the backpack for large objects comprises:
 a first wing;   a second wing, wherein the main body has two opposite sides which are respectively connected to the first wing and the second wing; the first wing and the second wing are connected to each other detachably; the first wing, the second wing, and the main body enclose and form a first holding space which has a top opening and a bottom opening; and   an extended piece which is connected to the main body close to either the bottom opening or the top opening of the first holding space.   
     
     
         2 . The backpack for large objects of  claim 1 , wherein the extended piece has a first side and a second side; the first side comprises a first connector, and the second side is connected to the main body; the first side of the extended piece is detachably connected to the main body by the first connector. 
     
     
         3 . The backpack for large objects of  claim 2 , wherein the second side of the extended piece is connected to the bottom of the main body; the first side of the extended piece is connected to the main body so as to cover the bottom opening of the first holding space. 
     
     
         4 . The backpack for large objects of  claim 2 , wherein the second side of the extended piece is connected to the top of the main body so as to cover the top opening of the first holding space. 
     
     
         5 . The backpack for large objects of  claim 2 , wherein the main body comprises a plurality of joint pieces, and the main body has a front side; the plurality of joint pieces are disposed at intervals on the front side of the main body, and are arranged from a part close to the top of the main body to a part away from the top of the main body; the first connector is detachably connected to one of the joint pieces. 
     
     
         6 . The backpack for large objects of  claim 3 , wherein the main body comprises a plurality of joint pieces, and the main body has a front side; the plurality of joint pieces are disposed at intervals on the front side of the main body, and are arranged from a part close to the top of the main body to a part away from the top of the main body; the first connector is detachably connected to one of the joint pieces. 
     
     
         7 . The backpack for large objects of  claim 4 , wherein the main body comprises a plurality of joint pieces, and the main body has a front side; the plurality of joint pieces are disposed at intervals on the front side of the main body, and are arranged from a part close to the top of the main body to a part away from the top of the main body; the first connector is detachably connected to one of the joint pieces. 
     
     
         8 . The backpack for large objects of  claim 2 , wherein the second side of the extended piece comprises a second connector; the first connector and the second connector are provided on two opposite sides of the extended piece respectively; the extended piece is detachably connected to the main body through the second connector. 
     
     
         9 . The backpack for large objects of  claim 3 , wherein the second side of the extended piece comprises a second connector; the first connector and the second connector are provided on two opposite sides of the extended piece respectively; the extended piece is detachably connected to the main body through the second connector. 
     
     
         10 . The backpack for large objects of  claim 4 , wherein the second side of the extended piece comprises a second connector; the first connector and the second connector are provided on two opposite sides of the extended piece respectively; the extended piece is detachably connected to the main body through the second connector. 
     
     
         11 . The backpack for large objects of  claim 1 , wherein the extended piece comprises a bag hanging from the main body. 
     
     
         12 . The backpack for large objects of  claim 11 , wherein the extended piece is provided close to the bottom opening of the first holding space, and the bag has an opening close to the top of the bag top; the opening communicates with the interior of the bag, and the first holding space is extended to the interior of the bag through the opening to form a second holding space, wherein the volume of the second holding space is greater than the volume of the first holding space. 
     
     
         13 . The backpack for large objects of  claim 1 , wherein at least one of the first wing and the second wing has at least a containing bag, and both the first wing and the second wing have an interior face which faces to the first holding space; the at least a containing bag is provided on the interior face of the first wing or the second wing. 
     
     
         14 . The backpack for large objects of  claim 1 , wherein the main body has a front side, and the first wing and the second wing are connected to each other through at least a fastener and at least a belt on the front side; the at least a belt is provided between the first wing and the second wing, and the length of the at least a belt is adjustable.