A urine drainage bag includes a bag body made of a urine impermeable paper and an absorbing body made of an absorbent material which can absorb urine. The bag body has an open upper end and a middle folding line along which the paper is folded so as to define a front sheet and a back sheet on both sides of the middle folding line. Two sides of the front sheet are coupled with two sides of the back sheet so as to define an accommodating chamber between the front and back sheets. Each of the front and back sheets has a curved end edge and a curved cover folding line between which a generally olive-shaped cover portion is defined. The olive-shaped cover portions of the front and back sheets can be folded to overlap each other so as to close the open upper end of the bag body.
a bag body made of a urine impermeably paper material having a middle folding line along which said paper material is folded so as to define an upper end open between a front sheet and a back sheet on opposite sides of said middle folding line, two sides of said front sheet being coupled with respective two sides of said back sheet so as to define an accommodating chamber between said front and back sheets, each of said front and back sheets having a curved end edge and a curved cover folding line between which a generally olive-shaped cover portion is defined, said olive-shaped cover portions of said front and back sheets being capable of being folded to over lap each other so as to close said open upper end of said bag body; and

an absorbing body made of an absorbent material which can absorb urine, said absorbing body being placed in said accommodating chamber and wherein:

said olive-shaped cover portions of said front and back sheets are inclined relative to said middle folding line after they are folded to close said open upper end of said bag body, each of said olive-shaped cover portions of said front and back sheets having a sharp upper end portion and a sharp lower end portion, whereby said urine bag is suitable for a woman or girl; and

each of said olive-shaped cover portions has a curved auxiliary folding line which extends from one end of said olive-shaped cover portion to the other end of said olive-shaped cover portion between said end edge and said cover folding line so as to define a generally olive-shaped upper end portion between said end edge and said auxiliary folding line, whereby when said urine bag is in use, said olive-shaped upper end portions of said front and back sheets are folded downward into said bag body so as to provide a comfortable contact of a user with said bag body along said auxiliary folding lines.