A postcard - is an open letter for a brief written message.

Size:

minimum - 90 x 140 mm;
maximum - 120 × 235 mm.

Letters - text on paper or other materials used in correspondence between two or more addressees. In the modern world, letters are sent in closed postal envelopes marked with special stamps.

Allowable attachments: various kinds of written messages.

Maximum size - length, width and thickness, combined: 900 mm, and the largest size cannot exceed 600 mm; minimum - 90x140 mm.
For letters with attachments, the maximum weight is 2 kg.

Small packages are international mail that can contain samples of goods or small items.

Admissible attachments: printed materials (forms, brochures, posters), photos, albums, objects of cultural-community and industrial purpose, notebooks, diaries, official papers, art and other literature, tape recordings and law cases.

Maximum size - length, width and thickness, combined: 900 mm, and the largest size cannot exceed 600 mm; minimum - 90x140 mm.
Maximum weight: 5 kg.

Packaging shall comply with postal standards.