A collapsible-locker, that is lockable, for receiving packages, may have at least one sterilizer for sterilizing at least some exterior portion of a given package received into the collapsible-locker. The collapsible-locker may have a sterilizer for sterilizing at least some exterior portions of the collapsible-locker where a person may be intended to interact with the collapsible-locker. The collapsible-locker may have a lid, a front-wall, a rear-wall, side-walls, and a floor that form main aspects of the collapsible-locker. Interior surfaces of the lid, the front-wall, the rear-wall, the side-walls, and / or the floor may be reflective to enhance UV (ultraviolet) light sterilizing the at least some exterior portion of the given package received into the collapsible-locker. The collapsible-locker may be configured to be attached to a side hinged door, wherein the hinged door provides access to a building for people.