A tab for attaching to sheet material comprises a substrate including a front side, a back side opposite the front side, an upper portion, a middle portion, and a lower portion. The tab includes a cut through the middle portion of the substrate to form a flap, an adhesive along the upper portion of the back side and along the lower portion of the back side of the substrate, and a fold-line through the middle portion which allows the substrate to be folded. When the substrate is folded along the fold-line, the flap extends beyond the fold-line and the back side of the upper portion faces the back side of the middle portion.