I'm Deysi from Design Squad, and I'm here with: So our goal for today is to make insulated lunch boxes to keep our popsicles cold.

This coat has materials that keeps pockets of air inside.

And air is a natural insulator.

And so it keeps the person wearing the coat warm, and what we're doing is trying to keep heat outside.

There is no such thing as "cold".

What does that mean?

"Cold" is when there's less heat in an area, and so we're trying to keep the heat away, and so we have less heat inside our lunch boxes.

ETHAN: I'm lining the inside with bubble wrap so that it creates another wall.

DEYSI: So Ethan, is that really a lunch box?

How would you carry it?

You would carry it like this.

(laughing) My lunch box is very portable.

You just carry it...

But you can't put anything in it.

DEYSI: If it's at least one popsicle.

I'm making my box bigger so I can fit more insulators inside.

I've put the bubble wrap around the newspaper so I can trap more air and have more air space.

DEYSI: The air is acting like a barrier or a wall to keep the heat from reaching the inside of the box.

DILLON: I rolled up some tubes and I put them all around this bigger tube to create better insulation.

DEYSI: Now it's time to put the popsicles in our lunch boxes.

ETHAN: So this is going to be an uninsulated bag, so we're going to put popsicles in it so that way this is like our control in an experiment.

And then we're going to take a walk and have a nice popsicle picnic.

We've been walking for about a half an hour to get here.

Hey, that looks like a good place to have a picnic.

First, let's check Shane's uninsulated bag.

Eww... Those got pretty melted.

Because we kept those popsicles in an uninsulated bag.

All right Deysi, let's check your lunch box.

My lunch box.

Oh, they're still pretty solid.

Huh!

They're still pretty solid.

Yeah!

So I'm going to take the pod out and see how my popsicle did.

It feels pretty solid.

DEYSI: So the popsicles did not melt.

They're still pretty cold.

I think mine stayed the coldest because I had the most popsicles.

The popsicles probably acted like ice cubes to each other, keeping each other cold.

Instructions to build a better lunch box are on the Design Squad website.

They're really good!

Tasty!

Mm, my favorite flavor: red.