Amazon offers Prime members its AmazonBasics 4-Piece Packing Cube Set in six colors (Black pictured) for $19.99 with free shipping. (Non-members can spend $49 to bag free shipping; otherwise, shipping costs $6.48.) That's $5 off list and the lowest total price we could find. It includes two 13.75 x 9.75" bags and two 17.5" x 12.75" bags.