Leisure Arts Crochet Rucksacks & Backpacks Crochet Book- Crochet a collection of trendy designs, perfect for carrying gear to class or all around town. Crocheted using 4 medium weight yarn, size H 5mm, size J 6mm, and size 7 4.5mm hooks. Has assembly instructions and diagrams to finish projects. 8 designs to choose from Largest measures approximately 16"x 17". 32 pages, softcover.