Mrs. Anderson’s Disposable Bread Proofing Cover Set keeps your dough moist and humid, creating an optimal environment for rising and proofing. The BPA-free plastic is tear-resistant and includes 50 bowl covers, 5 large tray bags, and 1 resealable storage bag. The elastic creates an airtight seal for faster fermentation, while the transparent design allows for easy monitoring. One-time use for easy cleanup.