Stubless multi-part assembly

A multi-part mailer construction, comprising superimposed first, second, third and fourth parts, said third part having at least one first hole therein of a predetermined first size along one of its margins, a quantity of detachable adhesive extending between said second and fourth parts and through said hole of said third part for securing said second and fourth parts together, said adhesive extending through said first hole having a cross-sectional size which is less than said predetermined size of said first hole so as to be spaced inwardly of the marginal edge of said first hole for retaining said third part in place, said first part having a first glue flap thereon underlying said fourth part and being secured thereto, said first flap being removably secured to said first part along a line of weakening located at one marginal edge thereof, and said second part having a second glue flap thereon underlying said fourth part and being secured thereto, said second flap being removably secured to said second part along a line of weakening located at a marginal edge opposite said one edge whereby said second and fourth parts are connected together and said third part is immobilized to form a mailer construction having open sides at other than said marginal edges with said first part detachably connected thereto along said first flap line of weakening, said one flap having said detachable adhesive thereon, and said parts each being devoid of any tear lines which may form a stub, whereby removal of said first part leaves said second, third and fourth parts intact, or separation of said second and fourth parts effects a break in said adhesive and frees said third part from the remaining of said parts while leaving said first and fourth parts interconnected, or removal of said first part together with separation of said second and fourth parts separates each of said parts from one another.