Post offices around southwest Michigan are joining the 25th annual Stamp Out Hunger Food Drive next month. The drive last year collected about 42,000 pounds of food around Berrien and Cass Counties. Each May, the National Association of Letter Carriers runs the effort, asking folks along their route to leave non-perishable food items by the mailbox. Nationwide, the Stamp Out Hunger Food Drive collected more than 80 million pounds of food last year. You can leave food items out for pick-up at your mailbox on May 13, or drop off items at a post office between May 7 and May 13. The U.S. Postal Service tells WSJM News the donated items all stay local. This is the 25th year for the drive.