1200-denier heavy-duty polyester, Dimensions: 12" x 18" x 11", Large 27L main compartment with dedicated 15" laptop sleeve 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, Reinforced Duravax™ base panel, Large main compartment, Zip organizer pocket