Walmart.com offers the Eastsport Trapezoid Backpack in Black, model no. 615240WM-BLK, for $11 plus 97 cents for shipping. That's the lowest total price we could find in any color by $8. It features an adjustable padded strap, main zippered compartment, zippered front pocket, and more.

BUY NOW: $11 + $1 s&h at Walmart