CRAZY ANTS 3P 37L Outdoor Tactical Backpack Military Rucksacks for Camping Hiking and Trekking Waterproof Size: 18.5 x 11 x 9.1 inch, 37L, Can hold laptop up to 15.6". Constructed of durable 900 denier polyester, waterproof and more durable than 600D. Padded and adjustable shoulder strap, Mesh padded back panel is hydration compatible.Molle webbing platform on face and sides for customizing with additional gear Contoured shoulder straps with quick release sternum strap and waist strap, waist strap is removable Main compartment with zip around closure, interior zip pocket and mesh pocket.