Bestbuy offers Samsonite - Modern Utility Convertible Briefcase to Backpack for 15.6" Laptop - Charcoal Heather for $39.99 (orig. $79.99) with free shipping.

Product Description:
A hybrid worth all the hype, the Samsonite Hybrid Laptop Brief, is the only bag you need to move with you and convert on the go! Wear 3 different ways, handheld, crossbody using the adjustable strap, or as a backpack utilizing the shoulder straps. The bag that transforms with your needs and your life! This clever convertible can be carried and packed as a traditional brief or simply untuck and clip the straps for the ultimate hands-free backpack. 

• Fits most laptops up to 15.6"
  Main compartment features a tricot lined, padded laptop sleeve sized to fit most laptops up to 15.6” or tablets; also includes a second storage sleeve for slimmer items. Padded wrap on top handles.
• Removable and padded shoulder strap
  Fits over most upright handles for hassle-free combination travel. It can convert the bag from handheld or backpack mode to wear on the shoulder or across the body. Make it easy to convert the bag to a backpack to tuck them and carry handheld as a brief.
• Adjustable crossbody strap
  3 ways to wear! Carry handheld, wear as a backpack using the shoulder straps, stow the straps and add the adjustable crossbody strap to wear on the shoulder or across the body.
• Easy and convenient handle
  Side grab handles for easy and convenient carry.
• Two-tone ripstop polyester material
  Built using durable, two-tone ripstop polyester and featuring our water-repellent coating.
• Front zippered stash pocket
  Perfect to store need-it-now essentials. An organization panel with a tricot lined open storage pocket, a larger zip pocket, pen sleeve, and key leash.