GLS, General Logistics Systems B.V. (headquartered in Amsterdam, the Netherlands), realises reliable, high-quality parcel services for 220,000 customers in Europe, complemented by logistics and express services. "Quality leader in European parcel logistics" is GLS guiding principle. In this context, sustainability is emphasized at GLS: its Europe-wide ThinkGreen Initiative bundles activities aimed at protecting the environment. Through wholly owned and partner companies, the group provides a network coverage of 37 European states and is globally connected via contractual agreements. 37 central transhipment points and 667 depots are at GLS disposal. With its ground based network GLS is one of the leading parcel service providers in Europe. About 14,000 employees handle 380 million parcels per year. Every day around 18,000 vehicles are on route for GLS. In the financial year 2012/13 GLS achieved revenues of 1.84 billion euros.