Buy POSO PS 602 travel backpack Tote Bag Handbag Classic Shoulder Tote Bag Fits 15.6 Inches Pakistan At Best Price. The PS 602 Travel Backpack is made from high-quality Oxford fabric with dust and waterproof features. Polyester lining is waterproof and effective. In fact, you do not have to worry about keeping your belongings in the rain when it rains. At the same time, the laptop compartment is equipped with a 3-layeranti-shock layer. Shock-resistant particle pads make your laptop safer when shakedown.