The combination of a plurality of razor shaving blade assembly units, retaining casings therefor and a flexible plastic storage tray for storing a plurality of said casings in side by side relationship thereon, each of said casings being adapted to retain a unitary shaving blade assembly unit, each shaving blade assembly unit comprising at least one blade and forming a head unit to which the blade is permanently secured and which provides a guard surface, said head unit being detachably engageable with a safety razor handle, each said casing defining a single chamber in which a single head unit may be retained, structure means in each said casing for retaining said head unit, therein against accidental removal in such a manner that a cutting edge of said blade is protected against damage and wherein said head unit is engageable by said handle while said head unit is still within said casing, each said head unit when engaged with said handle being withdrawable from the top of its casing by rocking said handle, said tray comprising slide means securing structure to secure each individual casing in said tray in said side-by-side relationship, and said tray and slide means being so configured as to permit each of said casings to be slid endwise out of said tray transversely thereof by said handle engaged with said razor head unit such that with said handle engaged with said head an operator may remove said blade unit from said casing or may alternatively slidably remove said blade unit and casing from said tray.