Top door of hog feeder flips open for easy loading. Built-in keyhole for hanging. Single door hog feeder has 50 lb. capacity and measures 20.75" x 12.75" x 29.5" with 10.25" top door opening. Double door hog feeder has 100 lb. capacity and measures 19.75" x 24.25" x 35.75" with 22" top door opening.