I work for HM Customs & Excise and recently spent a year in Russia under a contraband cooperation program running with the EU. They use clear wrap because loads are routinely stopped on the roads by the militia (police) and inspected in depots and entrepots for examination of the customs labels affixed to the necks of the bottles.
Every bottle has a gummed paper seal which encompasses the screw top, they're individually numbered and the authorities can run immediate checks on the serials to identify contraband.
For this very reason they're packed using transparent materials
Checks are frequently carried out because of the amount of moonshine which, in some cases, contain harmful chemicals and solvents.
Exported bottles are not subject to these regulations but are stored and transported solely by government approved agencies.