[Unique Sling Backpack]: The sling bag is a new design backpack, Support right/left switchable strap +3D decompression designed back pad. The strap is designed to clip either right or left shoulder, it is great for people who has preference in specified shoulder to pack and for another shoulder to rest. The pressure and tireness can be greatly reduced by the thickened shoulder strap and the 3D back pad, No longer feel hot with the breath-active net on the back. [Multipurpose Backpack]: The sling Backpack is a upgraded should bag, upgraded the size to18*11.5*4.5inch. These are 5 Pockets and 1 front pocket(The front pocket holds small items like cellphones etc.); 1 main pocket(for notebooks or Ipad 10.5inch), 1 back briefcase on the back(can filled with writing utensils),1 mesh pocket (can hold water bottle or umbrella), and 1 shoulder strap pocket-can be filled with small stuffs (can fit for iphone plus). [Multifunctional Shoulder Bag]: With USB Charging port design, Built-in USB cable in it. Use it to connect the automatic power supply, you can easily charge your phone. These is a mobile phone bag on the shoulder strap, allowing you to listen to music gracefully while walking.Under the mobile phone bag, there is a hole that can be used to carry sunglasses. [Travel Waterproof Backpack]: This backpack is made of high quality polyester Oxford cloth. It is waterproof, anti-scratch and anti-theft. It is specially designed, a lightweight durable crossbody bag, It is lightweight, waterproof, suitable for carrying, traveling, mountaineering, outdoor, school, hiking, etc.