A mailer package formed from a single sheet blank of foldable stock material comprising: at least one panel having opposing first and second major sides (118', 120'), the at least one panel having a closure flap with a tearable pull tab extending from a first edge; a compartment flap extending from a second edge of the at least one panel, the compartment flap being foldable about the second edge, the compartment flap having an attachment tab and forming a compartment having first, second, third and fourth sequentially adjoining sides (132, 134, 136, 111) by attachment of the attachment tab to one of the first and second major sides of the at least one panel, the first, second and third sides of the compartment formed by folds (121, 127, 129, 131) in the compartment flap, the fourth side of the compartment formed by the one of the first and second major sides of the at least one panel, the compartment having opposing first and second open ends (128, 130); a number of tabs (140, 146, 148) at each of the first and second open ends sufficient to cover and close each open end, each separate tab extending from a separate one of the sides of the compartment at the open end; and a cover extending from a third edge of the at least one panel, the cover being foldable about the third edge between a closed position wherein the cover overlies the other of the first and second sides (118', 120') of the at least one panel and an open position folded away from the at least one panel, the cover being releasably secured in the closed position by attachment of the closure flap to the cover and the secured cover being releasable to the open position with release of the pull tab. at least one panel having opposing first and second major sides (118', 120'), the at least one panel having a closure flap with a tearable pull tab extending from a first edge; a compartment flap extending from a second edge of the at least one panel, the compartment flap being foldable about the second edge, the compartment flap having an attachment tab and forming a compartment having first, second, third and fourth sequentially adjoining sides (132, 134, 136, 111) by attachment of the attachment tab to one of the first and second major sides of the at least one panel, the first, second and third sides of the compartment formed by folds (121, 127, 129, 131) in the compartment flap, the fourth side of the compartment formed by the one of the first and second major sides of the at least one panel, the compartment having opposing first and second open ends (128, 130); a number of tabs (140, 146, 148) at each of the first and second open ends sufficient to cover and close each open end, each separate tab extending from a separate one of the sides of the compartment at the open end; and a cover extending from a third edge of the at least one panel, the cover being foldable about the third edge between a closed position wherein the cover overlies the other of the first and second sides (118', 120') of the at least one panel and an open position folded away from the at least one panel, the cover being releasably secured in the closed position by attachment of the closure flap to the cover and the secured cover being releasable to the open position with release of the pull tab.