REI offers its REI Classic Medium Duffel Bag in Pinedale (pictured), Black, or Indigo for $19.93. Choose ship-to-store pickup to avoid the $5.99 shipping charge. That's $15 off tied with our January mention (of a shipped unit) as the lowest total price we could find. This nylon bag features 2,700 cu. in. of space, a storage pouch, dual zippers, wrap-around handles, and adjustable shoulder strap.