A cover for a module of fibrous material consists of a top member; a first side wall member with a first gap at its midpoint; a second side wall member with a second gap at its midpoint; first and second end wall members; a channel running along the bottom edge of the wall members and interrupted by the firs and second gaps; a first support strap at the midpoint of the first side wall member and within the first gap; a second support strap at the midpoint of the second side wall member and within the second gap; a securing strap having first and second ends and running through the channel, said securing strap supported by the first and second support straps as it passes through the first and second gaps; and a buckle securing the first and second ends of the securing strap.