Crowbar

Crowbar is an opener loop by stickmancomic. Every bag can always be stacked. The loop consists of two T-Spin Doubles, a Tetris and a Perfect Clear, with possibility of extra T-Spins or Tetrises.

First Bag
You will always be able to stack either the 1st bag setup or its mirror. Do the first one if L comes before J, and the second if J comes before L.

Second Bag
You will always be able to stack the 2nd bag this way. The placement of OSZ is interchangeable. There is a possibility of a T-Spin Single if either J or T is reasonably late.

Third Bag
You will always be able to stack the 3rd bag this way.

Fourth Bag
Again, you will always be able to stack the 4th bag this way. The placement of LSZ is interchangeable.

Fifth Bag
There is a 100% PC chance, though you only need 1 solution. The second solution however may give you a T-Spin Double.