Backcountry offers Osprey Packs Arcane 20L Tote Pack for $42 (reg $120). Free shipping on orders over $69. 

Product Description:
The Osprey Arcane Tote Pack can be your everyday tote for groceries or bringing supplies to the party, and it transforms into a backpack so you can use it as your carry-on for traveling. The zippered top has a unique roll-top closure with an aluminum buckle for extra security. Osprey made it completely out of durable recycled material for sustainable efforts. There's a padded sleeve inside sized for 15-inch laptops.
Details

• A tote that converts to a backpack for everyday life and travel
• 20L capacity suitable for carrying everyday essentials
• Over-the-shoulder strap transforms into backpack shoulder straps
• Zippered top closure with roll-top buckle strap for security
• Padded sleeve sized for 15-inch laptops
• Item #OSPZ18K