The envelope, polybag etc that contains the mailing piece.

The envelope that contains the components you wish to mail out.

The envelope that your package will be delivered in. Usually, a "teaser" line is on the front to entice the recipient to open your letter.

Being on the outside; external; farthest or farther from the interior, from a given station, or from any space or position regarded as a center or starting place; -- opposed to inner; as, the outer wall; the outer court or gate; the outer stump in cricket; the outer world.

being on the outside or further from a center; "spent hours adorning the outer man"; "the outer suburbs"

located outside; "outer reality"

One who puts out, ousts, or expels; also, an ouster; dispossession.

The part of a target which is beyond the circles surrounding the bull's-eye.

A shot which strikes the outer of a target.

The portion of the box which has the design on it and which surrounds the tray containing the matches.

relative to an imaginary point centrally located within the eye; further from this imaginary point