Weaver Leather Slow Feed Hay Bag The Weaver Leather Slow Feed Hay Bag is designed to promote slower feed consumption and promote better digestion. Its rugged 600 Denier polyester construction is great for use in stalls and trailers and designed to help alleviate boredom as well as reduce hay waste. Great for use in stalls and trailers, this hay bag easily hangs from adjustable, detachable straps. Top-loading design holds two average-size flakes of hay and features a mesh bottom for ventilation.