Pinqponq Blok Medium Changeant Pq778 Joseph Seed Wikipedia. Block Medium Changeant A style that works every day. Functionality that lasts for years. The Blok Medium from pingponq is an urban backpack with a clean design and sophisticated equipment. Made from recycled PET bottles and designed to support you from the work week to weekend adventures without compromising on style, quality or sustainability. Sustainable material from PET bottles, protecting the planet and your style Various accesses three zippered entries for easy access to items Travel comfort padded back and shoulder straps, chest belt Space and clarity laptop pocket (up to 15), side bottle pockets and organization inside All weather durability water repellent surface even in bad weather Material: 100% recycled polyester from PET bottles