Swanboat is a Wall STSD opener created by Winterfrost. The first bag requires an early S, O, and J.

Third Bag, I before Z

This path is the cleanest option when available, requiring I to come before Z to stack.

Afterwards, you can always stack a Trinity.

Third Bag, L before S

If Z comes before I, this can be used in conjunction with the S before L path to cover all queues.

Below is a possible way to guarantee a 4th bag T-Spin Double.

Third Bag, S before L

This can be followed up by a T-Spin Triple or regular stacking.