The Magnum Cookie Sheet Cover, sized at 21 x 17 inches, is like a protective shield for your big cookie sheets. It's made to keep your freshly baked goodies safe from things like dust and crumbs, so they stay fresh and yummy. Think of it as a handy tool for carrying your baked treats around without worrying about them getting squished or dirty. Plus, it's great for storing your cookies in the fridge or pantry until you're ready to enjoy them. And hey, it's not just for cookies! You can use it for all sorts of baked goodies, like pastries, biscuits, or even sandwiches and fruit slices. Best part? Cleaning up is a breeze. Just give it a quick wash by hand or toss it in the dishwasher, and you're good to go. So, if you love baking up big batches of deliciousness, the Magnum Cookie Sheet Cover is definitely a kitchen essential you'll want to have on hand!Optional Cover made of durable plastic. Fits Magnum cookie sheet 21" x 17" x 1-1/4"D. Aluminum cookie sheet sold separately.