The pasuk states (Shemos 12:34): ‘The people picked up their dough when it was not yet leavened, their leftovers bound in their garments on their shoulders.’ Sefer Zera Kodesh asks why it is necessary to say that the dough was on their shoulders. What difference does it make how they carried it?
He answers that the Torah is telling us that the food they took out of Egypt was not important to them at all. They threw it over their shoulders like one does to something unimportant because they fully trusted in Hashem to provide for them in the desert and didn’t really think it was important to watch over their food.