**Please Note: These envelopes are sized for reels only or reels with vintage single-reel storage sleeves. Full 3-reel packets with book and outer packaging will NOT fit in these envelopes. Please see images for appropriate uses. 50 clear resealable sleeves for the safe and convenient storage of ViewMaster reels. Perfect for careful collectors and dealers. Both sides are clear so you can view the title and contents of your collection quickly and easily. Turn your compulsion into an obsession with our View-Master storage sleeves! Envelopes are constructed of CPP (cast polypropylene), a safe material for archiving your View-Master collection and is often preferred over other plastics like PVC. CPP is known for being acid-free, PVC-free, and relatively durable, offering good protection for your View Master collection.