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. No-Waste seed save baffle prevents lost seed and nuisance birds from scattering seed onto the ground.