Baskets are used for servile work. The baskets here are the Apostles and their followers, who, though despised in this present life, are within filled with the riches of spiritual sacraments. The Apostles too are represented as baskets, because, that through them, the doctrine of the Trinity was to be preached in the four parts of the world. His not making new loaves, but multiplying what there were, means that He did not reject the Old Testament, but only developed and explained it.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).