Hygloss Products Manila Library Pockets. The high back pocket envelopes measure 6.25 x 3.5 inches and come with 50 envelopes per pack. These mini pockets are an indispensable part of any school's supply closet. Perfect for Library Management. The library pockets are great for keeping track of borrowed books, CDs and DVDs. They can also be used inside the classroom for students to keep track of when certain projects or assignments are due. Durable Design and Easy to Hang. The manila library pockets are made from strong, durable paper (80 lb. stock) that is acid-free and fade resistant. This will help prevent the miniature envelopes from turning yellow or wearing down easily. Tape or glue these pocket envelopes easily inside any book. You can also put the small manila pockets on a desk, wall, bulletin board, chalkboard, locker or cubby! The Hygloss Products Manila Library Pockets are proudly made in the USA!