this invention is a pre - made , re - closable , barrier providing , anti - corrosion protective bag which may , or may not , have a clear viewing port ( s ) or window ( s ) installed into the bag wall ( s ) ( see fig1 b ). the bag shall be of a 3 - ply construction utilizing three separate materials that each individually provides certain performance aspects which collectively produce an optimally protective package for whatever metal bearing asset the bag is configured for ( see fig1 a ). both the outer and inner plies of material must be heat - sealable to one another while the center ply may , or may not be . the outer ply is to be a flexible packaging material that provides barrier properties that are equal to or greater than those specified in mil - prf - 131 j . typically a film / foil / poly lamination would be utilized , however ; any heat - sealable flexible material that exhibits barrier capacity as noted above may be utilized as the outer ply . examples of possible substitute materials for the tri - laminate would include but not be limited to metalized films and laminations , coated films , co - extruded films , ceramic impregnated films etc . the center ply serves the purpose of cushioning the enclosed asset and enhancing the over - all puncture resistance of the bag . the material utilized is referred to as “ flat sheet plastic netting ” and is manufactured from low density polyethylene ( ldpe ) that is produced in a configuration having crisscrossing strands that measure 0 . 07 inches in thickness (+/− 0 . 01 ″) and that occur at four strands per inch ( see fig3 c ). alternative flexible or semi - rigid materials could be substituted for the netting which include but are not limited to polyethylene or urethane foam , bubble pack , air - cap , hdpe netting , woven or non - woven materials etc . choice of material to be utilized for the center ply is based upon the size and shape of the asset to be protected as well as the conditions of the project application ( such as amount of handling after packaging , use or non - use of additional outer packaging such as cartons or cases , etc .). the inner ply ( weapon / asset contact ply ) is produced by cortec corporation of st . paul , minn . it is referred to as cortec . vpci ®- 126 film . it is a 0 . 004 ″ thick ( 4 mil ) vapor phase corrosion inhibiting polyethylene film . this film ( or any film that contains vpci , or vci chemistry as part of its make - up ; either in coating form or impregnated within the film ) must be utilized as the inner ply . a vci is a volatile corrosive gas inhibitor . vpci refers to those inhibitors that , migrate out of a carrier substrate ( such as polyethylene film ) and form a gaseous vapor from which the vci molecules are attracted to and adsorb onto metal surfaces . this is known as vapor phase corrosion protection . the inner ply of the bag comprising this invention is made from either vpci film or vci film . vci molecules make their way from the inner ply into the interior of the bag and surround the weapon or other asset that is enclosed . the molecules then attach to all metal surfaces forming a microscopic coating over the entire metal surface area which prevents oxygen , moisture and other contaminants present in the environment from making contact with the metal which thereby prevents the occurrence of rust or corrosion . the interrelationship of all three plies working collectively to provide the optimum level of protection is described thusly ; the barrier properties of the outer ply keep the corrosion preventive molecules from the inner ply trapped inside the package while the center ply provides cushioning properties all of which result in an effective method of long term preservation . in severe environmental conditions the vci protection provided by the inner ply can be supplemented through the introduction of additional vci emitting devices / materials into the bag at the time that the weapon / asset is packaged . an emitter will provide even more vci molecules to the package thereby extending preservation effectiveness . in the three - ply lay - up ; all three plies of material are die - cut to shapes that are conducive to packaging any given weapon or asset . ( note that the materials could also be template - cut , laser - cut , or manually cut as well ). during the cutting process a series of small holes are punched around the perimeter of the inner ply ( i . e . a 0 . 125 ″ diameter hole , positioned 1 ″ in from any given edge and spaced every three inches apart ), to prevent air from being trapped between it and the outer ply and thereby creating a ballooning effect . if the window option is utilized all three plies of material also have a hole cut in them to accommodate the window . the holes are to be situated concentric to one another and in a location in the bag wall that is coincident with the location of the serial number on the packaged weapon / asset . to fasten the three plies together ; first the center ply is heat - sealed to the inner ply around their respective perimeters . then , the outer ply is aligned with the other two and heat - sealed around the perimeters . sealing the three plies together in this fashion creates a panel which has the center ply “ sandwiched ” between the outer and inner plies . the invention can be fabricated using two different methods . the first involves the utilization of just one three - ply panel ( see fig3 a ). once a panel has been constructed it is folded in half along its centerline such that inner ply faces inward and makes contact with itself . all of the un - folded edges are then heat - sealed except for one which is left as the bag opening . the second method involves the utilization of two separate three - ply panels ( see fig3 b ). each of the two separate panels is to be of the same shape and dimensions as the other except that one panel shall have a lip extension on the edge which is to be left as the bag opening . the two panels are placed in alignment with the inner plies facing each - other . all edges are then heat - sealed together except for those which will form the bag opening . the serial number viewing window may , or may not be installed , depending upon the application . if utilized ; the window material is cut in an identical shape to the hole ( s ) in the bag wall ( s ). the dimensions of the cut - out window material are to be greater ( i . e . 0 . 25 ″- 0 . 625 ″) than those of the hole ( s ). the window material , with its sealant layer facing the bag wall inner ply , is heat - sealed ( in concentric registration ) to the bag wall such that the hole ( s ) is / are completely covered and no gaps occur between the window material and the bag wall . the window shall be constructed from a clear flexible material that remains clear regardless of environmental conditions , has a polyethylene based sealant layer and is capable of minimizing the permeation of moisture vapor , oxygen and other contaminants through its surface into the bag interior . typical materials to be utilized as additional layers of the window material include but are not limited to : nylon , polyester , evoh , pvdc , aluminum oxide etc . the bag opening shall be fitted with a closure system that allows for multiple opening and closing cycles . this “ re - closable ” feature shall be achieved primarily through the use of a hook & amp ; loop assembly . first both the hook and the loop are cut to the exact same length dimension as that of the bag opening . additionally ; one strip of a heavy duty , heat - sealable flexible material for both the hook and loop pieces is cut such that its length dimension is the same as that of the hook or loop piece and its width dimension exceeds that of the hook or loop piece by 0 . 75 ″. the hook & amp ; loop pieces are then sewn onto the heat - sealable strips such that the ends of each are matched and the hook and loop pieces are centered on the heat - sealable strips ( which leaves a 0 . 375 ″ wide heat - seal flange area on each side of the hook and loop pieces ) ( see fig2 a ). after sewing has taken place ; the hook assembly is heat - sealed to the inner ply of the bag wall lip extension area at the opening . the face of the heat - sealable strip on which the hook is sewn must contact the inner ply of the bag wall and leave the hook material facing upwards . the loop / heat - sealable strip assembly is heat - sealed to the outer ply of the bag wall , immediately adjacent to and parallel with the edge of the bag opening and in alignment with the lip . again ; the face of the heat - sealable strip onto which the loop is sewn must make contact with the outer ply of the bag wall and leave the loop material facing upwards . once the bag is finished being fabricated , the lip ; with the hook assembly attached , is folded down onto the loop assembly which is heat - sealed to the bag face , in order to complete closure of the bag ( see fig2 b ). note that depending upon applications and the environmental conditions that effect each varying application , alternative methods of closure may be utilized . those alternatives include , but are not limited to : zippers , pressure sensitive adhesives , mechanical snaps , draw - string , magnets and etc . the re - closable , long - term , storage / preservation bags can be fabricated in an un - limited number of shapes and sizes ( see fig4 for an example of a bag designed for the preservation of m16 rifles ). simple rectangles , compound contours , multi - angled or even circular configurations can be produced . the bags can be either two or three dimensional and utilize any one of the numerous closure methods as described above . regardless of the choice ( s ) of materials to be utilized as the outer and center plies ; the inner ply shall always be some form of vci coated or impregnated heat - sealable film . the concept of the invention relies upon each of the three plies of the bag wall to perform as described above and collectively create an “ inner atmosphere ” within the bag that is rich in vci molecular activity that is prevented from escape from the bag by the outer ply and thereby maintains a corrosion - preventive environment within the bag for extended periods of time . this invention offers significant improvement over previous methods of asset preservation . time to pack - out assets and amount of personnel training required are both reduced significantly . the previous method required an individual skilled in the use and handling of mil - prf - 131j materials and heat - sealing equipment . use of this invention requires the packaging laborer only to view a sixty second demonstration of how to load the asset into a pre - made bag , effect the closure and place the packaged asset into its storage location . the previous method of packaging took roughly twenty minutes per weapon , where use of this invention results in a pack - out time of less than sixty seconds per weapon . another improvement that my invention offers over the previous packaging method is the ability to visually verify the serial number of the enclosed weapon without opening the package ; thereby eliminating the time consuming and costly task of re - packaging after number verification . the re - closability feature of my invention also offers significant improvement over the previous method with regard to time and expense saved after periodic weapon inspection . previously a package would need to be cut open to remove the weapon and then re - worked after inspection took place . this invention allows simplified removal and replacement into the same package through the re - closable opening . there are four pages of drawings included herewith with views described above .