Is the Cybex Cloud Z car seat compatible to use with the Cybex Gazelle S double stroller?

Hey, Alina,

Yes, with the Cybex adapters, all should work. That being said, it is a larger car seat, and for a double stroller, I can honestly tell you that a lighter, a bit less large one will leave more space for the second child and make the overall maneuvering with the car seats easier on you.

So, yes, it should be compatible, but maybe not the optimal choice for a double stroller, practicality-wise.