The charging standard for postal mail is mainly determined based on the delivery range and the weight of the package. For areas with a provincial area of ??less than 700,000 square kilometers (such as other provinces except Xinjiang, Tibet, Inner Mongolia and Qinghai), the fee for the first 1 kilogram package is fixed at 5 yuan. If the package exceeds 1 kilogram, the additional weight fee is 1 yuan/kg for each additional kilogram. For example, if you want to send 100 kilograms of items, converted into kilograms, it is 50 kilograms. The first weight is 5 yuan plus the additional 45 kilograms (1 yuan per kilogram). The total is 5 yuan + 45 yuan = 50 yuan. Therefore, the price for 100 kilograms of items is 50 yuan. Please note that the above prices do not include special services or additional packaging charges, which may vary depending on region and shipping needs.