Material for insulating shipments

I'm trying to insulate a frozen dessert for 2 or 3 days when sent via air or ground mail delivery.

I have a corregated box, with an air tight plastic bag wrapping a 1" thick styrofoam walls with dry ice (5 lbs) and the frozen dessert inside. I'm also using bubble wrap to fill the void air space around the dessert. The plastic bag is sealed air tight to prevent air from getting in.

Any suggestions on how to improve the insulation of this cheaply?

Thanks,
- Mike

Answers:

From: Randy Martin

i think what you are doing is enough already. unless you wanted to cover the package with fiberglass. lol just kidding.

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