Quote Originally Posted by Greg'sGarters View Post
If the temps are below 40 degrees, I'd put styrofoam insulation in, if the temps are below 15 degrees, I'd add a heat pack.

Temps below freezing you have to heat pack. Insulation is required like Steve said because it strengthens the box... Not sure if you have ever shipped before but it isn't just as simple as tossing them in a box. Look at the Shipping Discussion thread. Should help you understand a little more just how many requirements there are.