Plastic wrap. Foil makes it hot.
Plastic - Foil is metallic and conducts heat easier
For one thing, it's spelled PLASTIC WRAP and two. Aluminum foil keeps things cool, or cooler by how good it is as a insulator. It lets the temperature sort of flow through where it needs to go. And you can kind of control this by rolling the foil thicker or thinner.
You can find a travel cooler and warmer that keeps things both hot and cold at amazon.com, www.crateandbarrel.com, www.keepyourcooler.com, and sears.com.
Mainly because customers don't buy stuff that they can't see because it's wrapped in newspaper.
a zip lock bag because the air molecule move to colder ares
aluminum foil
aluminunm foil
It would definitely have to be plastic wrap because plastic wrap is an insulator, which aluminum is not.
aluminum foil
Me personally I would say that plastic wrap keeps things colder because it keeps things better contained than aluminum foil. See aluminum foil rips easily than plastic wrap. So I would say plastic wrap.
metal cup because it has insulation
Aluminumm foil paper keeps many things warm. It keeps things warm because instead of absorbing the heat that wants to get into the material you wrapped foil paper on, the foil paper refelcts back so that the heat does not absorb into the object or material.