S.O.G SOG85710331 Surrept Reversible Carry System Made of Nylon with Charcoal Gray Finish, 12 Liters Volume & Dual Configuration

Designed to work on its own or in conjunction with travel this backpack functions essentially as a drop-and-go bag. With 12 liters of storage, there's room for your laptop, and a few daily carry staples. On your back or at your side, either mode is configured for optimal carrying.