Amazon offers Prime members the adidas Team Speed Medium Duffel in four colors (Forest/Black pictured) for $24.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $8.14.) Outside of the mention below, that's the lowest total price we could find by $8. It features zipper closure, one interior zip pocket, and three exterior pockets.

A close price: Sports Authority offers it in Maroon/Black for $26.98 with free shipping.