This study addresses the two-echelon vehicle routing problem with grey zones and Customer-to-Parcel (C2P) stations. This problem arises in the search for new sustainable delivery schemes for e-commerce and last-mile distribution in urban areas and aims at reducing last-mile transportation costs. This study proposes a literature review on the subject, and a mixed integer linear programming (MILP) formulation to model and solve small instances of the described problem.