Sportube Overheader Boot Bag Carry on Boot backpack, 50 liter capacity, holds enough gear for a day on the hill including helmet Lightweight and strong, 840D Poly materials and padding stand up to the abuses of travel Hitching' technology creates perfect compatibility with any Sportube case for convenient maneuverability when traveling Contoured, padded shoulder straps improve comfort and ergonomics for stress free travel Finest quality YKK zippers and high end plastic and metal components improve durability and performance