Catspin

Catspin is a T-Spin Double → Double → PC opener, invented by CATboardBETA and Missplaced (Itsgr82beeme) on June 8, 2021.

Having both an early O and J piece reduces the probability of this opener being possible significantly, and shouldn't be used in such cases.

Basic setup:
First bag + Second J piece:

The J pieces can be substituted for Os in the case that you get an early O and a late J:

PC:

Variation 1:

Variations:
In the case you get both a late J and a late o, you can still build either a T-Spin Double or T-Spin Single:

Mirrored Setup:
Knowing the mirrored significantly increases the chances of a successful build.

Continuations when there is no PC:
It is not totally unlikely that your second bag will not give you the required I, T, and S (Or Z in mirrored) pieces early. During these scenarios, there are a few options on how you could proceed: