On our last week tour we managed with 75 pounds for me and my 2 sons on a triplet including food and water and all camping gear, so 25 lbs each and were very comfortable. A couple things we did that saved a lot of weight were (1) a solid fuel tab stove instead of whisperlite - once we got past feeling like geeks discovered that as long as you are not boiling a gallon of water it is great and gets smaller as you use fuel tabs. (2) 1.1 lb sleepingbags rated to 40 degrees from Dick's Sporting Goods (x3 saved 9 lbs!) (3) home made floorless tent from a flat fly and an REI mosquito net - Saved 3 pounds. We were confortable and had clothes for 3 days without need to do laundry. Could have continued across the country with our setup but unfortunatelly had to go back to work, For me 25 pounds seems about as low as we could go and stay comfortable (and not be stinky or do laundry every day). If we cut back from that we would have started to be less comfortable. Without food and water we were probably 18 or 19 pounds each. Also stopped carrying a spare tire and just bring duct tape wrapped around a chain lube bottle; you can temporarily patch a pretty badly shredded tire with duct tape and ride with the pressure lower than normal and maybe get 50 miles out of it which is enough to get to a bike shop most places (or at least meet another rider that will sell you their spare!). Still need a spare tube though...