Function & Design - The Design Concept Of The Shoulder Strap Is Exactly As Slim And Lightweight As Bag But Durable Enough. Computer Bag Strap Is Ultra-Thin To Release Your Shoulder;Top Handles Can Hide Away And Retract In To The Pocket, So You Can Carry It As A Sleeve Case;Luggage Strap Allows Laptop Bag Fixing On Luggage/Suitcase.