Read quickly, the poem sounds like a delivery order: oranges, two barrels of sun, sake, sack, lamb, veal. A carrier is meant to take these goods to another carrier, and the whole thing is framed by two moments of music, the morning "at my lute" and the evening "at my flute." The logic is more playful than practical, though. Words keep echoing each other, as in "carrier," "carry," and "carrier" again, and lute chimes with flute. The "pocket to carry in his pocket" loops back on itself like a riddle.
The speaker doesn't sound anxious about the load. The tone feels relaxed and a little amused, even content. Food, drink, and sunlight are treated as equally real, so an ordinary errand becomes a small feast. The title "Burden" hints at weight, but the sounds are light and musical. The mood is sunny and abundant, as if the day's work and its pleasures were just one long, tuneful passing-along.