i cant say i recommend shipping illegal substances. there are serious consequences for these kind of things. but im sure you know this. with that being said, this is a method that i've heard works well.
Someone was telling me about this. Get some jars of peanut butter. Remove about half the contents of each jar. Bag up your stash and bury it in a thick layer of peanut butter. Smooth it over with the peanut butter that you removed. Make sure the layers are thick.
Seeing how you are looking to ship alot of pot, you should have a good reason that you are shipping so much peanut butter back home. And if you do use this method i would think about resealing the peanut butter to make it look factory packaged. Again, i don't recommend shipping pot. But if you absolutely must, all i can say is Good Luck.
BR41N-ST3W