Amazon.com : G4Free Sling Bag RFID Blocking Sling Backpack 。* Unique 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. And protect your information security in public place * Perfect Size: 3 Main Compartments in all, only 12oz. The foremost compartment is 7.5 X 10.5 inches. The middle zippered is 8 X 11 inches--with 2 extra pouches, 2 pens pouches, and a key chain. The LARGEST zippered is 11 X 16inches. The Strap phone pocket size is: 3.3x6.5inch (WxL) with an earphone hole. 2 water bottle holders (up to 2.4 inches) with a contraction band * Reversible and Breathable: Good construction and lightweight, designed with one right / left easily switchable and adjustable padded strap and breathable back pad for your comfort. The adjustable strap range is 25.9 - 46.5 inches / 66-118cm. Perfectly fit your body * Water Repellent and Anti-friction: This sling bag is made of precision polyester with an SBS zipper, which is water-resistant, easy to clean, and anti-friction, effectively preventing it from tearing, wetting, and ripping. Has a certain waterproof performance, but can not be soaked totally in water for long period.