Amazon.com : G4Free Sling Bag RFID Blocking Sling Backpack 。?RFID Blocking Design: Back hidden RFID signal blocking pocket(7.5 X 8 inches), to protect your ID card, bank card, or phone from getting scanned and stolen. Protect your information security in public places ?Suitable Size: 3 main compartments in all, only 12oz. The middle zippered has 2 extra pouches, 2 pens pouches, and a key chain. The strap phone pocket size is: 3.3x6.5inch (WxL) with an earphone hole ?Reversible and Breathable: Designed with one right / left easily switchable, adjustable padded strap and breathable back pad for your comfort. The adjustable strap range is 25.9 - 46.5 inches. Fit your body more closely ?Water Repellent and Anti-friction: This sling bag is made of polyester, which is water-resistant, easy to clean and anti-friction, effectively preventing it from tearing and wetting. But can not be soaked totally in water for long period ?Multipurpose Travel Daypack: Can be used as messenger bag/shoulder bag/crossbody backpack/casual daypack/sling bag/chest bag for family weekend trip/ travel/work/outdoor and other occasions. A great travel gifts