diff --git a/backend/models.py b/backend/models.py
index d303888..ba4e2b4 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -64,7 +64,8 @@ class Item(Base):
     name = Column(String, nullable=False)
 
     user = relationship("User", backref="items")
-    tags = relationship("Tag", secondary=item_tag_table, backref="items", cascade="all, delete")
+    tags = relationship("Tag", secondary=item_tag_table, backref="items")
+    trip_items = relationship("TripItem", back_populates="item", cascade="all, delete-orphan")
 
 
 class Trip(Base):
@@ -89,5 +90,5 @@ class TripItem(Base):
     tag_id = Column(UUID(as_uuid=True), ForeignKey("tag.id"), nullable=True)
 
     trip = relationship("Trip", backref="trip_items")
-    item = relationship("Item", backref="trip_items")
+    item = relationship("Item", back_populates="trip_items")
     tag = relationship("Tag", backref="trip_items")