Backpack is a communicative-based series integrating the four skills (listening, speaking, reading, writing) with attention to grammar and vocabulary development. Through a motivating mix of photographs, illustrations, stories, poems, chants, songs,readings, exercises, games, and projects, students learn to communicate in English about themselves and the world around them. Backpack is a communicative-based series integrating the four skills (listening, speaking, reading, writing) with attention to grammar and vocabulary development. Through a motivating mix of photographs, illustrations, stories, poems, chants, songs,readings, exercises, games, and projects, students learn to communicate in English about themselves and the world around them.