The Natures Way Bamboo Hopper Bird Seed Feeder 6 qt (BWF18) has a wide opening for easy to clean and easy to fill feature. It is squirrel proof, bacteria and mold proof because it's made with solid cross-ply bamboo. It also features removable fresh seed tray for your convenience. The tray is rust free and will prevent mold and bacteria from growing with frequent cleaning. It can hold up to 6 quarts of seed. It has extra spacing to allow large birds like Cardinals and Jays to feed as well. It has stay clear, crack resistant windows and has a water based protective stain. Great to use with sunflower and mixed seeds.