Answer:
It creates a weary, yet sympathetic tone.
Explanation:
The line "Bent double, like old beggars under sacks" shows how the characters presented in the poem are tired with the activities and life they lead, however, the poem presents them as good people who are tired of being productive and looking for better progress what makes the reader sympathize with them. In this case, we can say that this sentence was written to create a tired tone, but also to generate the reader's sympathy.
