Rothco Waterproof Backpack Cover 2% Metal Pins (Steel) A unique concept using daily Black Frame A unique concept using daily reading lessons to teach American historyEasy to read stories that tell how America prospered during the Industrial Revolution and the Roaring TwentiesFourteen important historical topics are presented in eight page study unitsThe format of the study units is flexible and user friendly – perfect for differentiated instruction Features 10 double sided Activity Cards covering all aspects of STEM coated polyester ripstop composition of the backpack rain cover is designed to stand the test of time Rothco’s Waterproof Backpack Covers provide a powerful and compact way to keep your backpack dry in the great outdoors without taking too much space in your pack