A printable sheet material includes a panel having an integral separable portion and a starting mechanism formed on the separable portion. At least one tearable line is formed in the panel permitting the separable portion to be at least partially separated from a remaining portion of the panel. The tearable line includes a plurality of open “V” channeling cuts spaced along the line, each of the channeling cuts formed by a converging pair of cuts having a wider spaced end and a narrower spaced end. The channeling cuts are oriented with the wider spaced ends facing toward the starting mechanism to point in a tearing direction extending away from the starting mechanism. A patch is affixed to the remaining portion solely by an adhesive attachment device on the remaining portion and the patch overlaps less than an entire facing surface of the separable portion wherein when the sheet material is formed into an envelope and the separable portion is at least partially separated from the remaining portion an opening is created between an edge of the patch and the separable portion for at least one of direct view of, access to, and extraction of contents within the envelope.