Carry it all with you with the Betta Backpack/Sling by HOBO. This style comes in a high gloss shine back leather with Old English Brass hardware. The bag has a snap closure at the top and a back zippered pocket for your phone. The interior has a slip and pen pocket on the front, and a zip pocket, slip pocket and pen pocket on the back. This can be carried as a sling bag by zipping the straps together, or a back pack by unzipping the straps. 
 
Details: 
 
Strap Drop: 20 inches
Width: 11.5 inches
Height: 12 inches
Depth: 3.5 inches