Constructed of rugged tactical polyester. Key Features include: Modular attachment points on front and back. Made to accommodate various modular components to be designed and configured by the user on a personal basis. Adjustable shoulder straps, corded sides with lock. Numerous other features including inside mesh lining, heavy duty front zipper, 6 buckled snap closures to accommodate duty or pistol belt. Top grip strap and more! One size fits most.