I understand this is an extremely open question and depends on a ton of variables (what kind of backpack, my size & weight, temperature outside, etc), but I am looking for advice from people that have gone a long distance (~100 miles) wearing some sort of backpack (on their backs). It would only be for 1 or 2 days.
I've been touring for a while (x-country) with my Surly LHT and four panniers, but now would like to lighten the load a ton and get back on my road bike. Just trying to see what's feasible.
I'll probably only be carrying the following (sleeping bag, sleeping pad, rain pants, rain jacket, a pair of jeans, 2 shirts, 2 underwear, wool shirt, 2 prs sox, 3.5 pound laptop & cord, phone, camera).
Am I in for a painful day &/or back problems? Anybody out there do much riding with a backpack on?
Thanks for any input!