The 42-year-old Turkish citizen – who was serving a seven-year sentence – had been making stationery with other prisoners destined for the shops.
At the end of his shift, the inmate climbed into a cardboard box and was taken out of prison by express courier. His whereabouts are still unknown.
The chief warden of the jail told the BBC this was an embarrassing incident.
The prison authorities in Willich, near Duesseldorf, said the man, who was tall and broad-shouldered, had hidden in a box that was about 150cm by 120cm.
When the weekly express courier arrived to pick up several boxes of merchandise, the one containing the prisoner was also loaded into the back of the lorry.
Shortly after it had passed through the prison gates, the inmate made his dash for freedom by cutting a big hole in the tarpaulin of the lorry and jumping off.
The driver alerted the police after he noticed the tarpaulin flapping in the breeze. – bbc