As the resource for warehouse logistics, IWLA is the only trade association that represents the interests of third-party logistics (3PL) providers across North America. The International Warehouse Logistics Association (IWLA) is the unified voice of the value-added warehousing and logistics industry, representing third-party. The Izaak Walton League is one of America's oldest and most successful conservation organizations. The Izaak Walton League is one of America's oldest and most successful conservation organizations – and we are the only organization training, equipping, and. The Izaak Walton League is an American environmental organization founded in 1922 that promotes natural resource protection and outdoor recreation. Warehouse Logistics Professional (WLP) Certification and Short Courses and Events - Established in 1891, IWLA is the oldest trade.