Academy Sports & Outdoors offers the Nike Heritage Backpack in several colors (Thunder Gray/Black pictured) for $22.49. Pad your order to over $25 for free shipping. Excluding padding, that's the lowest price we could find by $4. It can accommodate laptops up to 15" and features padded shoulder straps, a side water bottle pocket, and top haul loop.

Update: It now starts at $29.99, but drops to $22.49 in-cart.