One size. Skill Level: 2 - Easy This day pack, or book bag, pattern is perfect to make for carrying things for school or work, or for going for a hike. The bag closes with a double zipper and has a large outer zippered pocket, as well as a hang loop at the top. The inside has an option for adding a padded pocket that can store electronics or small computers (and adds a layer of comfort). The adjustable straps can also be padded. Pack Size: 14 x 10 x 5 (35.5cm x 25.5cm x 12.5cm) Suggested Fabrics:Pack: Waterproof 400 denier nylon Pack Cloth, 500 denier nylon Cordura, or medium to heavy cotton duck.Padding: Lightweight fleece Fabric Requirements:1 yd 45 or 60 (115cm or 150cm) wide fabric1/8 yd (12cm) padding for strap only OR 3/8 yd (34cm) padding for strap plus optional inside pocket Notions:1-1/4 yd (115cm) #5 coil zipper, three #5 coil zipper pulls, 1-1/4yd (115cm) 1 (2.5cm) nylon webbing, two 1 (2.5cm) double bar buckles, polyester thread.