M&M's Peanut Butter 55oz Bag. If you love Peanut Butter M&M's then you are going to love this bulk bag. There are 55oz pf M&M's Peanut Butter in a resealable bag. Perfect for a candy dish or something to snack on at home or in the office. Grab them by the handful or pour them into a candy dish, either way there is lots to enjoy.