900 denier polyester. PVC lined. Only bag included in purchase. 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. Star of life emblem pictured on bag. Orange Back pack. These bags are great for medical use, construction tools, school kids, work bag, camping, fishing, hiking, etc. EMS/EMT back pack. Large main zippered compartment measures 12'' x 18.5'' x 7.5''.