Why Packet Sleeves? For over four decades View-Master Packet collectors have been placing their 3-reel Packets in plastic sleeves for protection and preservation. But for years everything tried was left lacking for want of various qualities. Usually if the sleeves were even remotely close in fit, they were too thin and soft and required a carboard backing which obscurred viewing the back of the packet. And there was never a means to close the sleeve without use of messy and potentially dangerous tape. Then in 1992, 3Dstereo introduced the vinyl 3-reel Packet Protective Sleeve. This sleeve is many times thicker than previous sleeves offering not only protection and presevation but support, and halting any further damage to the perforated edges of later Packets, all this without requiring any backing at all. And by just tucking in the top flap, the sleeve is neatly closed and sealed, able to be opened and reopened without fear of damage to your Packet or sleeve. Now, today, and for the last seven years the 3Dstereo Packet Sleeves are crystal clearer than ever, enhancing the appearance of the Packet itself. And they are so low in acidity, that they qualify as archival. And today, storage case manufacturers have been making storage cases to fit the View-Master Packet in its sleeve. So if you want: protection and presevation archival security support with complete two sided visibility beauty enhancement easy to close and reopen top flap. Then you need 3Dstereos Protective Packet Sleeves.