Alright guys, this may be a unique question. Im from alaska and wondering if anyone knows about bike/rafting in an Alpacka raft? Basically, I take the wheels off of my bike and stack the frame + wheels on top of a small inflatlabe wilderness boat (weighs 6lbs) along with a 20lb pack. This way I do long stretches of trail and whitewater/float rivers (week long). Ive been doing these kind of trips for awile and I NEED A LIGHTER BIKE. What would be a good frame option...I drag the bikes up steep rocky embankments, and paddle glacier fed rivers with them. It would have to be very light(but tough), as I commonly shoulder the bike for 2 or 3 thousand verticle feet over a mtn pass. I dont want to spend over 600$ on a frame though...Im afraid I will ruin it. What do you all think?