Regulations Governing Customs Clearance Procedures for Importing and Exporting Postal Parcels Article 3

Imported and exported postal articles must meet the following conditions:1. Must not be an article prohibited from import stipulated in Article 15 of the Act.2. Must not be an article prohibited from import or export in accordance with other laws.3. The gross weight per unit (bag) must be less than 30 kilograms.
中文原文 郵包物品進出口通關辦法第3條
進、出口郵包物品,應符合下列條件:
一、非屬本法第十五條規定不得進口之物品。
二、非屬其他法律規定不得出口或禁止輸出之物品。
三、每件(袋)毛重三十公斤以下。

English translation for reference only; the Chinese text prevails. Not legal advice.