I would say sealed container as it is the air that spoils it.
A metal bowl keeps ice cream frozen the longest.
styrofoam
a cheese burger
Because cheese is from the gods. It keeps you warm at night. Kiss me.
sugar
The longest available brand of cheese balls or puffs are CheeWees which were first sold in 1936 and are still made and sold today by Elmer's Fine Foods..
there is no longest it just keeps going.
A hypothesis would be: I believe the Extra (R) gum's flavor lasts the longest.
Ripened cheese will last longer b/c it has usually already molded like Swiss, Cheddar, etc.
Stainless Steal
The cold inhibits bacterial growth and mold.