Answer:
Behind or underneath the opened package
Step-by-step explanation:
If you put it on top of the old package, then that package would go bad because you would use the new package up before you remembered the old package and you would waste it.
If you put it as far back and out of sight as your refridgeartor allows, then you would forget about it.
If you put it in a different area, then you wouldn't be able to find it when you needed it.
Hope this helps! ( ̄︶ ̄)↗