Shortly after my grandmother died, my father transported her ashes from Hertfordshire to West Yorkshire to inter them (by manual excavation!). This was done because transporting a body renders you liable to a hefty tax from each and every local authority you cross with it. To get to the point - approaching home he was running early and felt a thirst coming on, so pulled into a passing pub for a pint of Tetley's mind relaxant. Taking the Tesco's carrier bag with granny in it with him! At the bar, as he supped and watched the cricket, a pubster asked what was in the bag. "My mother." "Yer having a laugh!" "Take a look.."
*and the pub went quiet*
The ashes, by the way, were at least in a casket, not loose. Perhaps the answer is a casket fused for air burst..