About The Mailbox Bookbag: Help struggling students improve their reading and writing skills with The Mailbox Bookbag magazine! Bookbag is devoted to developing and strengthening literacy skills through engaging ideas and intriguing lessons. Bookbag is filled with easy to use activities and skill-building practice sheets that are reproducible and ready to go with no preparation. The result is stronger teaching and greater learning that will help your students meet and exceed state test standards. Add Bookbag magazine to your classroom or library to help even the most reluctant readers achieve success.