Ebay offers High Sierra 70L Packable Duffel Bag for $13 (reg $34.99) with free shipping.

Product Description:
Cramped for space? This High Sierra duffel conveniently packs away when not in use. The easily adjustable low profile shoulder strap and padded grab handle provides total comfort on the go. With an external zippered slip pocket and large main opening your packing and unpacking can be done in a cinch.

• Dimensions (Overall): 19.5 Inches (H) x 11.75 Inches (W) x 11.7 Inches (D)
• Weight: 2.2 Pounds
• Holds up to: 40 Pounds
• Shell Material: Polyester
• Placement: Carry On
• Bag Structure: Unstructured
• Interior Features: Zip Pocket
• Exterior Features: Zip Pocket
• Main Compartment Closure: Zip Closure
• Handle Type: Carrying Handle
• Number of Wheels: No Wheels
• Handle Material: Polyester
• Capacity (Volume): 70 Liter
• Protective Qualities: Water-Resistant
• Fits Laptop: No Laptop Pocket
• Bag Linear Inches: 43 Linear Inches
• Care & Cleaning: Spot or Wipe Clean