【USB Charging Port & Headphone Jack】The external USB charging port and headphone jack are designed for convenient use. The external USB charging port is designed in the side pocket invisibly, beautiful and practical, with this cross-body backpack you can charge any device while traveling anytime anywhere. 【ADJUSTABLE REVERSIBLE SHOULDER STRAP】 The lower part of the mens sling bag is designed with 2 D-rings, which can be changed from left to right shoulder, and only need to be connected with the left or right D-ring. You can freely adjust the shoulder straps of crossbody backpack. The bag for men is easy to adjust the length from 23.6 inches to max 45.28 inches to meet your requirement. Material: Waterproof Oxford cloth 【SUPERIOR QUALITY MATERIAI】 The bag is selected nylon 101% fabric, durable, scratch-resistant, waterproof, comfortable, and lightweight. The waterproof backpack come with high-density and strong hand straps will reduce your burden and travel easily. Smooth double zipper, sturdy buckle, and reinforced stitching make the backpack for men more durable. The shoulder bag use widened shoulder straps make you're carrying comfortable and stress-free. 【MEDIUM CAPACITY AND MULTIPLE POCKETS】The hiking backpack is 7.28x3.14x11.81 inches (LxWxH). The mens sling bag has a main zipper pocket with 2 inner layers, a front zipper pocket, a back zipper pocket, and 2 drawstring pockets. The fanny pack for men has enough room for all your essentials such as an umbrella, smartphone, wallet, credit card, headphone, power bank, tissue, iPad, etc. 【FUNCTION AND OCCASION】 The waterproof sling bag is super comfortable, lightweight, and durable to carry, it can work as a sling bag, chest bag, crossbody backpack, hiking bag, working or business bag, and travel bag to keep your hands free. Two ways of wearing: the left, or right. Suitable for hiking, kayaking, snorkeling, gym, cycling, camping, walking, traveling, fishing, school, and daily use.