An ostomy pouch has a pair of opposed side walls, one of the side walls defines a stoma-receiving opening for, in use, receiving a part of a stoma into the ostomy pouch, one or both of the side walls being formed of a polymeric film at least partially coated on an internal surface thereof with hydrophobic particles, the hydrophobic particles includes: a metal oxide core; and a hydrocarbon chain having from 2 to 40 carbon atoms, wherein the hydrocarbon chain is chemically bound to the metal oxide core.