Nylon Imported RFID PROTECTION: Hidden back pocket to block RFID signal, protect your ID card, credit card or phone from scanning and theft. And protect information security in public places Tips: The earphone hole is closed. You can cut it open as you like MULTIFUNCTIONAL POCKET: 0.27 kg. The size of the sling bag is 7.5 x 4 x 15 inches, good enough to accommodate the items you need. A hidden security pocket on the padded back can hold your passport. 2 side pockets fit a water bottle or folding umbrella REVERSIBLE AND BREATHABLE SHOULDER STRAP: Designed with one right / left easily switchable and adjustable padded strap and breathable back pad. The adjustable strap range is 21.5 - 41.5 inches. Which can hold the phone screen size under 7 inches easily SUPERIOR MATERIAL: This sling backpack is made of water-resistant polyester fabric. Bar-Tacks Processed at the seam will provide extra strength and long-lasting performance. Durable two-way SBS zippers are abrasion-resistant and ensure secure closure MULTIPURPOSE DAYPACK: This crossbody backpack with vibrant colors is the perfect companion when you are out. Suitable for travel; day hikes; daily walk-around; cycling; excursions; sports; camping and shopping