900D POLYESTER PVC LINED LARGE MAIN ZIPPERED COMPARTMENT MEASURES 12''X18.5''X7.5'' MANY INTERIOR POCKETS/POUCHES FOR STORAGE INTERIOR MESH POCKETS INTERIOR ELASTIC LOOPS FOR PENS/TOOLS, ETC PADDED BACK PADDED 3'' WIDE ADJUSTABLE SHOULDER STRAPS WITH PHONE POUCH WITH HOOK AND LOOP CLOSURE TOP CARRY HANDLE TWO FRONT STRAPS WITH QUICK RELEASE BUCKLES ID HOLDER ON ONE SIDE REFLECTIVE STRIPING ON FRONT MESH POCKET ON FRONT AND BOTH SIDES