Walmart offers the Ozark Trail 25-Liter Roll Top Backpack in Gray for $14.74. Choose in-store pickup to avoid the $5.99 shipping fee. That's tied with our mention from three weeks ago and the lowest price we could find by $6. It holds a 15" laptop, is hydration compatible, and features an internal sunglasses pocket, bike light attachment, four side buckles, padded back and straps, and adjustable sternum strap.