Coordinating backpack is to be used to store your new sleeping bag. It is not suitable for use as a school backpack. ... Thomas the Train Steamies vs Diesels sleeping bag set. Included are one sleeping bag, 30 x 54 inches, and one coordinating backpack for easy storage. ... CONTENTS: One slumber bag. Size when zipped is 30 x 54 inches (76 x 137 cm).; One coordinating backpack.