USPack Logistics (www.gouspack.com), a NewSpring Holdings portfolio company and leading same-day courier and transportation company, today announced that it has completed the strategic acquisitions of Best Courier and Delivery Services and JS Logistics. Best Courier and JS Logistics are the seventh and eighth acquisitions for USPack, the third and fourth under NewSpring Capital, after most recently acquiring Parsippany, NJ-based Flash Courier, and Alexandria, VA-based Washington Courier in March 2016 and September 2015, respectively. The St. Louis Post Dispatch covers the news…