Lewis N Clark Electrolight Day Pack, Red/Charcoal Ultra-lightweight durable silk-nylon fabric is water and stain resistant. Breathable padded back and straps, adjustable sternum strap, and internal mesh zip pocket and flap zip pocket. Large main compartment with cinch top External zip pocket with rfid- blocking material prevents unauthorized scanning of data stored on credit cards . Rfid products block 13.56mhz, which is the standard for credit cards/passports Size- 15in x 12in x 5in 15x12x5