Paying Zakat-ul-Fitr using a bag with a label showing its weight without ensuring the written weight

A: It is necessary to be sure of the measure of the bag, which one will give as Zakat-ul-Fitr. It is not sufficient to depend on the label written on the bag or the random estimation that it equals such and such amount, because it may be of a lesser amount, thus one is not fully clear from the obligation of Zakat-ul-Fitr.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.