Consider a piece of matzah (unleavened bread) and how it pictures the Messiah:
Matzah is not puffed up with leaven. Messiah was without sin (Hebrew 4:15).
Matzah is pierced. Messiah was pierced for our transgressions (Isaiah 53:5).
Matzah is striped. Messiah was whipped and striped, and by His stripes, we are healed (Isaiah 53:5 KJV).
Baptism/Immersion
The seventh day of Chag Hamatzot, the last day of the moed, is when the Israelites passed through the Red Sea. The entire nation was immersed and "baptized", so to speak. When we are spiritually baptized into Messiah, we are baptized into His death (Romans 6:3), that we might live to righteousness (1 Peter 2:24).
Our next stop... some traditions of Chag HaMatzot.
