1200 denier heavy-duty polyester. Large 17L main compartment with dedicated 15" laptop and tablet sleeve. Rain Defender® durable water repellent (DWR) keeps your gear dry in light rain. Contour fit shoulder straps. Padded air mesh back panel. Rainforced Duravax™ base panel. Large main compartment. Zip organizer pocket. Dimensions: 12" x 18" x 11".