I have three rucksacks, my second purchase is very good (a Lightwave) but chafes like mad on my shoulders. Ok, I accept it might be the wrong size for my back length, or I may have 'the wrong type of shoulders' but once purchased and stuck with it, I'm sure most people would like to try some innovative idea to remedy such a problem.
So what ideas can be used. I used to fold my spare socks and place them under the shoulders straps, it did help! I talked to one man, a serving Marine, who placed kitchen sponges from Poundland under the straps. I should have tried this but in the end I bought a new one.
Do you own such a rucksack and if so, how do you solve your problem?