Abstract: Envelope seal strip are disclosed. An example envelope includes a flap that is rotatable about a hinge between an open position and a closed position of the envelope. The example envelope includes a first adhesive layer disposed on an inner surface of the flap and a sealing strip having a second adhesive layer. In the open position, the sealing strip is releasably coupled to the first adhesive layer via the second adhesive layer. To secure the flap in the closed position, the first adhesive layer and the second adhesive layer enable the sealing strip to decouple from the first adhesive layer, the hinge enables the flap to rotate about the hinge to cause the first adhesive layer to adhere to a second wall, and the second adhesive layer enables the sealing strip to adhere to the second wall and an outer surface of the flap.

Abstract: A sealing strip on a release layer is disclosed. The release layer can include an envelope with walls cooperatively enclosing a pocket with an opening. The envelope can include a closure flap pivotable to close the envelope. A first location of the envelope can include a sealing strip releasably adhered to the envelope (or a release layer on the envelope). This sealing strip can be removable from the first location and placeable in a second location overlapping the closure flap in the closed position and an adjacent portion of an envelope wall. The sealing strip can include an adhesive capable of adhering to the closure flap and adjacent portion of the second wall for securing the closure flap in the closed position. The sealing strip can include a removable grasping tab connected by a weakened area. The sealing strip can be provided on a release layer independent of an envelope.