Shop for Storage & Organization . The HDX 18 in. 5-shelf plastic shelving unit is constructed of heavy duty plastic, giving you a storage capacity of 750 lbs., evenly distributed. Place this multi-purpose 5 Shelf Storage Organizer in your home, garage, basement or utility areas to help keep your space clean and organized. Each shelf unit is 36 in. W x 18 in. D x 72 in. H, making it a great fit for storage in your home or office. Each shelf can hold up to 150 lb. and has a span of 14 in., designed to hold most size storage totes. The ventilated shelving is easy to clean and it's raised feet will help prevent water damage.