shipping usps

So how do ya'll ship your products without the heat getting to them? Also how do you all ship your products in general? Cheapest most cost effective way while being quick and effective as well. I searched the forums but most of it was about stock shipments vs sending out products to customers. I...

I thought we could not ship fragrance oils below 200 degrees flashpoint via USPS. if you go on Bramble berry you see all the flash point below 200 degrees stating it has to be shipped by FedEx. I was searching on to the USPS website and came across this...