Final answer:
The literary device used in the given statement is a simile.
Step-by-step explanation:
The literary device used in the given statement is simile.
A simile is a figure of speech that compares two things using the words 'like' or 'as'. In the given statement, the speaker is comparing themselves to a 'brown bag of miscellany propped against the wall'. This comparison helps to convey the speaker's feeling of being insignificant or unimportant.