The Guardian Anti-theft Backpack is great for traveling and theme parks. It opens in the back which when wearing is against your back so no one can get into your goodies. The lining is a waterproof canvas that has a zippered pocket, a slip pocket, and a built in credit card slot. The exterior has 2 side pockets to accommodate a cell, water bottle or sunglasses. Three strap options to use with a grab handle, shoulder strap and backpack straps.