Derby Originals Heavy Duty 3 Layer Bottom Half Bale Bags STURDY, LONG LASTING CONSTRUCTION - our bale bags are made with a three layered base, composed of strong nylon material with a  plastic sheet sandwiched between them for extreme strength and durability. HAY SAVING DESIGN - these bale bags are completely enclosed but ventilated so you wont lose hay while also protecting it from mildew and rot, being destroyed by rodents and other pests, etc. VENTILATED - our bale bags have eight air holes across the front and back sides for ventilation and breathability so that your hay stays fresh and dry during storage and transport. HOLDS A HALF BALE - these bale bags are generously sized and will accommodate at least half of a two-string hay bale and up to half of a three-string bale thanks to their 22 x 22 x 18 size. EASY TO TRANSPORT - these bale bags have a pair of carry straps so that they can be carried around with ease. These bags are lightweight and can be comfortably fit into cars, trucks, or trailers for transportation.