Heavy duty, 1680 denier ballistic polyester and 1800 denier patterned polyester construction Modular design allows for three different bag configurations (top and bottom bag can be mounted individually or zipped together) Can easily convert from a strap mount to magnetic mounted bag with additional mounting bases (sold separately) Top Bag: Built in adjustable GPS pocket accommodates a variety of phones and GPS devices Removable, replaceable map pocket Expandable main compartment allows for an increased storage capacity External zippered side pockets with zipper garages Two sip tubes and media port access holes Hinged lid with underside organizer pockets allows easy access and organization Two tone black on grey soft lining interior Integrated carrying handle Includes visor storage pouch, water bladder storage bag, and a clear window rain cover Standard: 14"L x 10 1/2"W x 8 1/2"D (18 Liters) Expanded: 14"L x 10 1/2"W x 10 1/2"D (20 Liters) Black Bottom Bag: Hideaway backpack straps Organizer pocket Two tone black on grey soft lining interior Compatible with optional removable Tablet/iPad pocket, optional accessory pocket, and removable map pocket 14"L x 10 1/2"W x 4"D (10 Liters) Black Note: Bag includes attachment zipper for strap mounting base.