These crates are made from polypropylene plastic, weighing 1.4 lbs. each. They measure 15.4" L x 10.25" W x 8.25" H when open and collapse to 2.25" H. They can be stacked up to 3 high and have a maximum load capacity of 22 lbs. per bin. Price drops from $44.99 to just $27.99. Shipping is free with Amazon Prime or is otherwise a flat $6 per order.