Amazon has the Hurley Classic Backpack (Obsidian, One Size) for $17 with free shipping on $35+ or with Prime. List price: $39. Features made with durable Ripstop Nylon with a polyurethane coating, adjustable straps carry handles, spacious main compartment, includes padded laptop compartment.
Has excellent Amazon Reviews.
Amazon has the Hurley Classic Backpack (Obsidian, One Size) for $17 with free shipping on $35+ or with Prime. List price: $39. Features made with durable Ripstop Nylon with a polyurethane coating, adjustable straps carry handles, spacious main compartment, includes padded laptop compartment.
Has excellent Amazon Reviews.
$17
Amazon has the Under Armour Undeniable Sackpack (1369220, White/Halo Gray/Halo Gray) for $19 with free shipping on $35+ or with Prime. List price: $25. Features highly water-repellent finish, TPU-coated bottom panel, front insulated zippered pocket, fleece-lined front valuables pocket, adjustable cording straps.
Has excellent Amazon Reviews.
Amazon has the KAVU Original Rope Sling Bag (944-347- Flamingo) for $23 with free shipping on $35+ or with Prime. Features made with a high-quality 600D polyester, water-resistant and durable, adjustable rope shoulder strap and side release buckle. This sling pack is the perfect size for daily use, weekend trips, or outdoor adventures.
Has excellent Amazon Reviews.
Amazon has the SwissGear Endure ScanSmart 17" Laptop Backpack (6752303409) for $50 with free shipping. Features trolley strap, integrated organizer, laptop and tablet compartments, TSA-friendly ScanSmart to avoid unpacking through security.
eBay has the SWISSGEAR Travel Laptop Backpack w/ Trolley Sleeve (multiple colors) for $25 with free shipping.