The eurohike syke trail 30 is designed to fit comfortably on your back with a well ventilated and padded back system the tri flow technology and meshed construction will provide a breathable performance preventing your back from sweating too much on your long walks to leave you feeling ready to take on the outdoors for longer features laptop compatible designed to fit laptops up to 17 inches meshed back system and shoulder straps tri flow ventilation for a breathable performance to keep y