Here's what other sites are saying:
The Topo Designs 30L Travel Backpack stays as flexible as your itinerary, ready to chase the stoke at a moment's notice. On top of looking great, it's compact enough to use every day, with a laptop sleeve and comfortable backpack straps, but roomy enough for a week's worth of clothes. It's built to last forever, as evidenced by a lifetime warranty from Topo. If you're the type of traveler who'd rather wing it, this is the bag for you. Keep it stocked with a couple pairs of socks, underwear, and an open mind. Go!
Features of the Topo Designs Travel Bag 30L Foam structure with padded ballistic nylon back panel U-shape entry to large main compartment Internal mesh organization pockets U-shape entry to secondary organization compartment Larger zippered security pocket and Dual slip pockets Vertical exterior zippered pocket with Dual security pockets Easy access to back panel laptop compartment, Fits most 15? laptops Stowable contoured padded spacer mesh shoulder straps Load-lifter straps and sternum strap Removable waist belt Pass-through panel secures bag to rolling luggage handle Top and side carry handles Removable adjustable padded shoulder strap Vertical daisy chain webbing Heavy-duty YKK zippers with security loop on main compartment Travel Bag attachment clips Meets most airline carry-on requirements