Here at army surplus world the rio grande backpack is so popular we carry it in several different colors and in several different sizes. The rio grande back pack is made of rugged synthetic material. The rio grande backpack has a padded back panel with built-in ventilation channels, a large main zippered compartment and two side zippered pouches. The rio grande backpack has deluxe features throughout with a padded hip belt and fully adjustable shoulder straps. The rio grande backpack is available in three sizes: the 25 Liter 21' x 12' x 6', the 45 Liter 25' x 13' x 12', and the 75 Liter 32' x 18' x 8.5'. Colors include: Black, Marine Woodland digital, Woodland Camouflage, and Army Digital. Order your rio grande backpack today.