W&F Gear via Amazon offers the WandF Foldable 40-Liter Duffel Bag in several colors (Black pictured) for $16.99. Coupon code "5DXH8K2J" cuts it to $11.89. With free shipping for Prime members, that's the lowest price we could find by $10. This 20" wide, waterproof bag has an adjustable shoulder strap. Deal ends July 26.