From Sewing Patterns by Mrs H:
The Bookbag Backpack is a multi-purpose bag that is perfect for commuters and students, for busy parents, or for days out and travelling.
Dimensions
With finished dimensions of 12" (30.5 cm) wide, 15" (38 cm) tall, and 3" (7.5 cm) deep, this versatile bag is big enough to hold multiple items. One tester managed to fit a laptop, an A4 folder, and her book into the bag, as well as her usual travel items!
Bag Features
This adaptable bag has three different types of strap, making it readily adjustable to your needs - backpack straps, top handles, and a detachable shoulder strap. The large front panel of the Bookbag Backpack is perfect for showing off feature fabrics. The handy pockets make it easy to keep track of where you've stowed your belongings. The sewing pattern includes a hidden zipped pocket on the front, for storing your keys or travel card, and a zipped pocket inside for smaller items.
The bag can be stabilised with either fusible fleece or Soft & Stable depending on how sturdy you wish it to be. For extra strength, you can choose to add optional rivets to the bag.