Answer: Big white plastic shopping [bag?]
Step-by-step explanation:
Usually, we have adjectives in the order of quantity, quality, size, age, shape, color, nationality/origin/material, and purpose.
With this in mind, the correct order is:
Big white plastic shopping
-> I am going to assume this is "Big white plastic shopping [bag]" and the last "big" is meant to be bag, but I am unsure.
Big = size
White = color
Plastic = nationality/origin/material
Shopping = purpose