According to the regulations of the Civil Aviation Administration of China, each person can carry one article, the volume of each article does not exceed 20×40×55 cm, and the weight does not exceed 5 kg. As long as this limit is not exceeded, yoga mats can be taken on the plane. However, if the yoga mat is too big, such as 80 cm long, it may not be possible to carry it with you on the plane and need to be checked.
Whether you can fly depends on the regulations of specific airlines. It is recommended to confirm with major airlines whether you can take yoga mats with you before you travel.