You should remember postal restrictions. Here is the list of prohibited items:

• Perishable goods;
• Any types of medicine;
• Human organs and (or) tissues, blood and it's components;
• Soft drinks, alcoholic products, ethyl alcohol, beer (allowed to transfer in a limited number: only 0,5 liter of alcoholic products);
• Tobacco goods and smoking mixture: only 2 packs of cigarettes allowed;
• Plants of any shape and condition, plant seeds;
• Precious stones of any kind and condition, natural diamonds, with the exception of pieces of jewelry;
• Goods of national, culture and historical heritage of the Ukrainian people in accordance with the laws of Ukraine;
• Live animals;
• Narcotic substances, psychotropic substances and their precursors, poisonous substances;
• Information  connected with the extremist activity, Nazi symbolism on any media types;
• Any types of weapons or products similar to weapons including brass knuckles and boomerangs;
• Ozone destruction substances;
• Hazardous waste products;
• Mineral raw materials;
• Special technical devices for the surreptitious obtaining of information;
• Objects of export control;
• Military goods;
• Gas lighters;

And also:

• Materials of obscene or immoral nature;
• Permission for carrying a weapon;
• Employment records;
• Military tickets;
• Passports and other documents of identity;
• Export of which is in violation of the intellectual property rights.