Samsonite Tote-a-Ton 33" Duffle Luggage for $19.99.  Shipping is free on orders over $35.  If needed, use this Filler Tool to pad the order for free shipping.  Here is a screenshot for reference.  It is made of 400 denier nylon, collapsible and features over 6,000 in³ of space, and a zippered interior pocket for small items.