DuckCorp Dico

Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Reff /rˈɛf/ <neut, n, sg>
   external frame pack <n>, load carrying frame <n>, carrying frame <n>, pack frame <n>
      Synonyms: Rückentragegestell, Rückentrage, Räf
    see: Rückentragegestelle, Rückentragen, Reffe, Räfe