Easy Organization: This small sling backpack has 1 main compartment, 2 front pockets, 1 RFID back hidden pocket and 2 side pockets fit a water bottle (under 20 oz) or folding umbrella USB Port Design: With a built-in USB charger port outside and a charging cable inside, the travel crossbody bag offers a more convenient way to charge your phone while hiking. (The backpack doesn't power itself, usb charging port only offers easy access to charge) RFID Protection: Back-hidden RFID signal-blocking pocket, to protect your ID card, bank card, or phone from getting scanned and stolen. And protect your information security in public places Convenient Shoulder Strap: Designed with reversible and padded strap and breathable back pad for comfort. The strap range is : 21.5-37.5 inches / 55-95cm. The strap pocket: 5x3 inches (WxL). Can store change or earphones(mobile phone is not allowed) Water Repellent and Anti-friction: The sling bag is made of precision canvas with SBS smooth zipper, which is water-resistant, easy to clean, anti-friction, effectively preventing it from tearing, wetting, and ripping. Fit for outdoor, travel, day trips