In November 1943, the postmaster for German troops in the Crimea decided to relax a previous prohibition on shipping parcels back to Germany through the feldpost system. In order to control the amount of parcels being shipped, he required parcels to have postage in the amount of 20 Pf and a parcel permission stamp.
The parcel permission stamps were printed by the local newspaper "Der Kampf", on newspaper in sheets of 10x10. The text reads "1 Päckchen Richtung Heimat", or 1 parcel to the homeland.
They are found in two sizes --
Type I -- 41x23mm
Type II -- 36x28mm
The Type II also features a unique typesetting issue -- the "n" are actually inverted "u".
These stamps are pretty rare, and currently catalog for €1,600 each.