A bag of madder is a bundle of madder roots, wrapped in cloth and bound with cords for transport. It’s a period charge, found in the arms of the Worshipful Company of Dyers, c.1530 [Bromley & Child 79]. The bag of madder is fesswise by default. For related charges, see cushion, wool-pack.
Elysant d’Antioch bears: Argent, a bend sinister between a tree blasted sable and a bag of madder gules corded sable.
Nikolai Kolpachnik Spiach’ev bears as a badge: A bag of madder erminois.