The plastic containers are offered as an add-on fancy way to store the wooden ingredients of the game.
- Kitchen Rush includes 6 ingredients (meat, vegetables, cheese, pasta, bread, salad)
- Kitchen Rush KS promos comes with Fish orders and Fish tokens
- Piece of Cake will include 2 ingredients (cream, fruit)
So if you already own Kitchen Rush KS edition and got 7 containers in the previous campaign, the set of 2 plastic containers will cover your needs.
If you are going to get now the base game and the expansions, one set of 9 containers is suitable for you.