Abstract: A dust proof container which defines an outer layer made of a reinforcing web material and an inner layer adhered to the outer layer and made of an elastomeric material. The container defines a sealable opening between a first edge of the container and a second edge of the container, and the container further comprises a locking part located on the outer layer at the opening. The locking part defines an open state, in which the first edge and the second edge are spaced apart, and a closed state in which the elastomeric material of the inner layer at the first edge contacts the elastomeric material of the inner layer at the second edge.