A letter may be ordinary, registered and insured, with maximum weight up to 2 kg.
Ordinary letter is intended for documents and it is not recorded through postal documents during its conveyance.
Registered letter is intended for important documents or goods and it is recorded and registered through postal documents during the acceptance and delivery phases in domestic traffic and in all phases of conveyance in international traffic.
Insured letter is intended for very important (valuable) documents and valuable items (goods). For insured letter it is necessary to indicate value and insured letters are individually recorded through postal documents during all phases of conveyance.
- minimum dimensions of a letter are 90x140mm, with a tolerance of 2 mm;
- maximum dimensions of a letter: sum of its length, width and height must not exceed 900mm, while the greatest of all such dimensions may not be over 600mm
- minimum dimension of a cylindrical letter may be 170 mm in sum of its length and two diameters, in which case the letter's length may be at least 100mm.
- maximum dimension of a cylindrical letter may be 1040 mm in sum of its length and two diameters, while the greatest of all dimensions may not exceed 900mm.