There are certain size and weight restrictions which must be adhered to if your article is to be accepted into the International Mail network.
For international purposes, an airmail letter is an oblong article with a length, a width, a thickness and a weight. Air mail letters include postcards or greeting cards, and aerogrammes
An airmail letter must not exceed :

Any article which exceeds any of these limits is considered a parcel.
An international Parcel is any article that is is not an Air Mail Letter.
The maximum weight of an International Parcel is 20kg, but it may be lower depending on the destination country or the International Post service used to that country. Refer to your country in the International Post Guide for details.
The length of the longest side of a parcel must not exceed 105cm.
The girth of a parcel must not exceed 140cm.
Some examples of how to measure the length and girth follow:
Cylinders If the parcel is a long cylinder, its axis (length) must not exceed 105cm and its circumference (girth) must not exceed 140cm.
If the parcel is box shaped, its length (its longest dimension) must not exceed 105cm. The girth, measured around the two other dimensions, must not exceed 140cm.
If the parcel is an irregular shape, its length is the distance between the two furthest-apart points on the surface of the article, and must not exceed 105cm. The girth, measured around the thickest part of the article at right angles to its length, must not exceed 140cm.
The girth of a parcel must be at least 16cm. For example, a broom handle or a pencil shaped parcel is not acceptable. If the parcel is box shaped, both its length and width must be at least 5cm.
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