Amazon.com: Waterproof Sling Bag Crossbody Backpack for Men 。*Adjustable Sling Bag: The flexible strap of chest bag can be adjusted varied,You can freely adjust the shoulder straps according to your preferences.This crossbody backpack is perfect for men *Large Capacity: Size: 13.8 x 6.7 x 3.6 inches.Shoulder bag with multiple compartments and pockets including a hidden security pocket, mobile phone pocket,big pockets with room for all your belongings. Sling backpack can effectively keep your belongings, such as cosmetics,tissues,keys, mobile phones,ipad mini,passports,water bottless,umbrellas,etc *USB Hole & Headphone Hole: Cross body bag with USB Hole & Headphone Hole(without portable charger),You may charge your mobile phone easily with the USB charing port (using the implanted USB cable connect your potable power supply). A Mobile Phone Pocket in shoulder strap makes you convenient for charging and listening while walking