A few years ago, a friend of mine died here in UK. His wife had him cremated with due solemnity, and said she would take him(his ashes) back to Thailand. All she did was to put the ashes in a biscuit tim, seal it with Sellotape and put it in her suitcase. In her village he was duly interred in a Stupa in the village with a ceremony presided over by the local monks.
I know a biscuit tin does not seem to be the right way of transporting ashes but she had no problems at either end. Maybe she was lucky or maybe Lord Buddha was watching over them both.
Dick & Tim