At critical points, such as the transition from free fermentation piles to the ground surface or at the edges of a bunker silo, silo sacks create both an important oxygen barrier and weighting device. Gravel or sand-filled Polydress® PE silage sacks reliably meet this purpose without damaging the silo in any way. Another plus point: with the HDPE silage sand sacks from RKW, the environment endures less pollution because the sacks can be used for up to ten years or longer – an acquisition that is truly worth it, and at the same time, protects the environment.