Timbuk2 and TerraCycle are putting the “messenger” in “messenger bag.” The The San Francisco-based carryall-maker has teamed up with the New Jersey upcycler to transform decommissioned U.S. Postal Service mail bags (circa 1960-1990) into tough-as-nails stuff-shleppers ready to take on rain, snow, sleet, and gloom of night—and not necessarily in that order.