A special delivery for your backyard birds – the Absolute metal squirrel-resistant Air Mail feeder is a novelty envelope shape with AIR MAIL imprint. extra large capacity of 5 lbs. mixed seed means less filling and more watching. Double-sided for multiple bird viewing. Easy lift up flap for top fill. The spring activated perch can be adjusted to accommodate large or small birds and to prevent squirrel/s access to seed. Also included are 2 bags if Wildbirds Unlimited Birdseed.