וַיִּשְׂא֥וּ אֶת־שִׁבְרָ֖ם עַל־חֲמֹרֵיהֶ֑ם וַיֵּלְכ֖וּ מִשָּֽׁם׃
그들이 곡식을 나귀에 싣고 그 곳을 떠났더니
Or HaChaim on Genesis
וישאו…וילכו, They loaded…and went on their way. The Torah mentions this to show that they did not linger after their sacks had been filled. Unless the Torah wanted to make this point, the whole verse is unnecessary. We would all have assumed that the brothers carried their supplies with them.