I had this same conundrum as I wanted to spread my mom's ashes in Spain while I was going along the Camino de Santiago. I was told unofficially that customs would probably not let me bring ashes into the country and would most likely confiscate them. So I've devised my own method... I use large, empty vitamin bottles. I've *taken* my mom around the world in the past 4 years but I still have a LOT of ashes left. If you can't manage to take them all, perhaps just a few small containers as a symbolic gesture. I'll continue to *travel* with my mom until the box is empty aside from a small porcelain jar for sentimental purposes.