Blast O Butter Ultimate Theater Style Microwave Popcorn is for extreme butter lovers. This full-flavor popcorn delivers an intense, savory movie theatre butter flavor in every bite. The best butter popcorn hands down, this movie theater buttery popcorn is our top-selling flavor. Not only does it taste great; Blast O Butter gourmet microwave popcorn is 100% whole grain, gluten-free, and contains non-GMO kernels. Each carton contains 24 (3.2 oz regular size) microwave popcorn bags. New, Consumable, Shelf-Stable Microwave Popcorn.