El Prado Travel Carrying Bag, Messenger Bag & Backpack for Microsoft Surface Pro 3/ Pro 4 Windows Pro 8.1 12.1" Tablet 3 in 1 Multipurpose Travel Carrying Case | Ideal for Business, School and Everyday Use | Can Be Converted in to a Backpack, CrossBody Bag Messenger Bag or Simply Just a Carrying Bag (Handbag) | Suitable for Laptop Computer, Notebook & Tablets | Additional Compartments to Keep All Your Essentials Organized and in Handy | Organization panel inside the front pocket stores your cell phone, iPod, Boarding Passes, Passports and Many Business Essentials While Also Allowing Plenty of Space for Power Cords Extra Padding on Main Compartment | Lightweight Design | Durable Matte Silver Hardware | Top Quality Water Resistant Nylon Construction | Non Scratch Interior Lining Material | Includes Adjustable Shoulder Strap | Hidden Detachable Backpack Strap Approximate Main Compartment Internal Dimensions 13.75in x 11in x 1.75| Approximate External Dimensions 15.75in x 12in x 3.25 Suitable for Microsoft Surface Pro 3 / Pro 4