A multipurpose backpack is provided. A multipurpose backpack is a bottom member for forming a backpack through folding, comprising: a first region defining a front surface of a backpack; a second region defining a rear surface of the backpack; and a second region defining a third region adjacent to at least one of the first and second regions. A shoulder strap disposed in at least one of the first region and the second region, a first connecting member disposed in at least one of the first and second regions and coupled with the first stretcher support bar, Second and third connecting members arranged in the third region and connected to the supporting bar for the first stretcher and the other supporting bar for the second stretcher, a first supporting member connected to the first connecting member and the second connecting member across the third region, And a second supporting member connected to the first connecting member and the third connecting member across the third region and different from the first supporting member.
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