Place bottom crust in 9-inch pie plate. Trim edges to one inch.
Mix berries, sugar and flour in a large bowl and empty into pie plate.
Top filling with remaining pie crust. Trim edges and fold under bottom crust. Cut vents in top crust.
Bake in a 375 degree preheated for 1 hour, 15 minutes or until the filling is bubbly and the crust has browned. Cover the edges with aluminum foil if they start to brown to quickly before the filling is bubbly.
Let pie cool for at least 3 hours before cutting. Seriously. The filling has to cool down completely and then think about before it sets up.