the Greek word ostrákinos [os-tra-kin-os] means "earthen, made of clay".
The word is used metaphorically in 2 Corinthians 4:7 of the frail human body of believers – which serves as the temple of the Holy Spirit.
Matthew Henry also used this metaphor for "earthen vessels".
I especially like how he connects it with the first creation, light, in the book of Genesis.
"As light was the beginning of the first creation; so, in the new creation, the light of the Spirit is his first work upon the soul. The treasure of gospel light and grace is put into earthen vessels.
The ministers of the gospel are subject to the same passions and weaknesses as other men. God could have sent angels to make known the glorious doctrine of the gospel, or could have sent the most admired sons of men to teach the nations, but he chose humbler, weaker vessels, that his power might be more glorified in upholding them, and in the blessed change wrought by their ministry." Matthew Henry's Concise Commentary