This is a surprisingly interesting paper bag (honestly). The illuminated manuscript letter W in the centre takes its inspiration from The Winchester Bible, “the largest and perhaps finest of all surviving 12th-century English bibles“. I believe the two figures entwined within the letter depict God addressing Jeremiah and giving him the gift of prophecy:
“Then the LORD put forth his hand, and touched my mouth. And the LORD said unto me, Behold, I have put my words in thy mouth“. Jeremiah 1:9.
In the original the two figures are much closer together, with God actually touching the lips of Jeremiah inside an illuminated letter, which you can see if you follow the link above.