Don't use the postal service! This advice is fucked up...it will add more federal time if you get popped. Use overnight! If the vacuum sealing fails, the aroma takes some time to permeate the packing material...the package may just make it through. This advice comes from a dude who has been sending pot around the country since the 1970's, and NEVER had a package not make a destination. In one case I was stoned and left a zero out of the address.. the helpful Fd Ex people found the name, recognized the error and delivered the pot on time anyway.