I commute to work everyday and it's a 60km round trip. Wanting some options other than a back pack to carry all my stuff. It's approaching summer here and I hate the sweating feeling when using a back pack. What r my options? I have been thinking about a big saddle bag that people use when bike packing or the seatpost mount rack. What are the Ergon packs like cos there design seems to take eliminate some of my problems.