The Sack of Bran is a historical item which can be found by Karl in Vaubecourt during Chapter 3.
Location[]
After acquiring the police uniform inside the station, head up to the attic then go all the way left to collect this item.
Description[]
"Wheat was rare, so cereals were used to make flour for bread. Wheat bran is darker and composed mainly of fibre but also crammed with vitamins and minerals. Today it is an integral part of high-fibre diets; back in the day, it was a sign of hard times."