I have recently (last 5-6 weeks) gotten back into long-distance riding after being away for 20+ years, and I'm wondering what other folks are using to carry all necessary supplies on their treks. I've got a small saddle bag for extra tube, compressed air & tire tools, and 2 bottle racks. Everything else (cell, lock, food, etc.) I'm carrying on my back in a smallish knapsack. I'm finding this to be somewhat uncomfortable after a few hours, and I'm wondering if it is also creating a lot of unnecessary wind resistance as well. Would really appreciate any thoughts and advice, since I'm not familiar yet with the various carrying systems out there. I thought about a bike rack, but it seems pointless to add all the extra weight to a very light (<20lbs. for a 56cm) carbon fibre bike. Thanks for the help !!