Freitag bags are made from used truck tarpaulins, car seat belts, inner tubes from bicycles tires and used airbags. There's the story about the two bike riding designers(brothers) who lived next to a track route in Zurich. Spurred by the inherent characteristics of discarded used truck tarps that were virtually indestructible and 100% water proof they began to design bags for themselves, then friends. Soon the word spread around and the rest is history.