The new wineskin in Matthew 9:17 is the church life
Matthew 9:17 - "Neither do people pour new wine into old wineskins. If they do, the skins will burst; the wine will run out and the wineskins will be ruined. No, they pour new wine into new wineskins, and both are preserved."
Ephesians 1:22-23 - "And God placed all things under his feet and appointed him to be head over everything for the church, which is his body, the fullness of him who fills everything in every way."