try lavender seems to mask my hash deliveries (smells more stronger than most buds ive came across) domestic shouldnt really be a problem depending on the country ect.
NO SMELL!!! Don't use anything, no coffee, no lavender, just vac pack that shit twice, or 3 times if you really want to be safe. 1 layer of Vac Sealing starts to smell after about 48 hours in a car, I've been "in transit" with a large quantity with only 1 layer of Packaging and by the 3rd day, the car was stinking!!! Never again! I no longer drive any quantities of weed, I think the US Mail is a lot safer.