Butter Bags is the proper spelling of the words Butter Bags.
Butter Bagz is a derivation of the original words Butter Bags.
The derivation Butter Bagz stems from pop culture references using the letter “Z” instead of the letter “S”. In general, substituting the “Z” for the “S” is an accepted societal norm although references to an underworld culture may subvert the good intentions of Butter Bagz™ and it’s mission to share decarb + infusion science with the world.