Abstract: The trash bag raincoat is a waterproof, biodegradable trash bag that has been adapted so as to convert between trash bag and rainwear. A conventional trash bag is altered by the addition of a hood, sleeves, and fasteners in such a manner as to ensure easy conversion from trash bag to rainwear and back to a trash bag. The invention addresses the age-old practice of tearing holes in trash bags so as to use as protection when caught in unexpected precipitation. This hole-tearing practice destroys the use of the trash bag for its intended purpose and makes for unsatisfactory protection as the head and arms remain exposed to the weather. The current invention addresses the issue of full protection for the head, arms, and torso and offers the ability to reuse the trash bag for its original design. This is accomplished by manipulating the hood, sleeves, and fasteners in a manner designed to fit the need at hand—use as trash bag or protection against the elements.