wrappings,  where  size  permits,  except  as follows: l   Classified   written   material   should   be folded  or  packed  so  that  the  text  will  not  be in  direct  contact  with  the  inner  envelope  or container. “  The  inner  envelope  or  container  shows the  address  of  the  receiving  activity;  the highest  classification  of  the  material  enclosed including,   where   appropriate,   the   Restricted Data  marking;  and  any  special  instructions.  It should  be  carefully  sealed  to  minimize  the possibility  of  access  without  leaving  evidence of  tampering. Attach   the   receipt   form   (if required). l  The  outer  cover  should  not  bear  a classification  marking,  a  listing  of  the  contents divulging  classified  information,  or  any  other unusual  data  or  marks  that  might  invite special  attention  to  the  fact  that  the  contents are classified. The outer cover of Confidential   material   being   transmitted   by United  States  Postal  Service  First-Class  Mail should   be   marked   FIRST-CLASS   and   be endorsed    POSTMASTER: D O    N O T FORWARD,   RETURN   TO   SENDER. Whenever   the   classified   material   being transmitted is too large to prepare as described above,  it  should  be  enclosed  in  two  opaque, sealed   containers,   such   as   boxes   or   heavy wrappings,  or  prepared  as  follows: l  If  the  classified  material  is  an  internal component   of   a   packageable   item   of equipment,  the  outside  shell  or  body  may  be considered  as  the  inner  enclosure. l     If     the     classified     material     is     an inaccessible  internal  component  of  a  bulky item  of  equipment  that  is  not  reasonably packageable,  such  as  a  missile,  the  outside  or body   of   the   item   may   be   considered   as   the outer  enclosure  provided  the  shell  or  body  is not   classified. l  If  the  classified  material  is  an  item  of equipment  that  is  not  reasonably  packageable and  the  shell  or  body  is  classified,  it  should be  draped  with  an  opaque  covering  that  will conceal   all   classified   features.   The   coverings must  be  capable  of  being  secured  so  as  to prevent  inadvertent  exposure  of  the  item. l   Specialized   shipping   containers, including  closed  cargo  transporters,  may  be used   instead   of   the   above   packaging requirements.   In   such   cases,   the   container may  be  considered  to  be  the  outer  wrapping or  cover. l  Material  used  for  packaging  should  be of  such  strength  and  durability  as  to  provide security  protection  while  in  transit,  to  prevent items  from  breaking  out  of  the  container,  and to   help   detect   any   tampering   with   the container. The   wrappings should  conceal all classified    characteristics. Activities   will provide  for  the  stocking  of  several  sizes  of cardboard  containers  and  corrugated  paper. Packages  must  be  sealed  with  tape  that  will retain  the  impression  of  any  postal  stamp, preferably  brown  paper  tape.  Bulky  packages must  be  inspected  to  determine  whether  the material  is  suitable  for  mailing  or  whether  it should   be   transmitted   by   other   approved means. Closed  and  locked  compartments,  vehicles, or   cars   should   be   used   for   shipments   of classified   material   except   when   another method   is   authorized   by   the   consignor.   In any  event,  individual  packages  weighing  less than  200  pounds  gross  should  be  shipped  in  a closed   vehicle. ADDRESSEES Classified  material  is  normally  addressed to   a   recognized   activity   and   not   to   an individual.  Office  code  numbers;  office  or division   titles,   such   as   Training   Division;   or 8-9