What are the weight and size restrictions for sending mail?

Australia Post has specific weight and size restrictions for sending mail. The maximum weight limit for parcels depends on the service chosen. For regular parcels, the maximum weight is 22kg, whereas for Express Post, it is 20kg. When it comes to size limitations, the longest side of a regular parcel should not exceed 1.05m, and the sum of its length and girth must not exceed 2m. However, the size restrictions may vary based on the service and destination. Small and medium letters should also meet specific size criteria. The maximum dimensions for small letters are 130mm x 240mm x 5mm, while medium letters should not exceed 260mm x 360mm x 20mm. These restrictions are essential to ensure smooth processing and transportation of mail items throughout Australia.