[MENTION=147740]prathmann[/MENTION], When I built my first touring bike a few years ago I followed the advice of experienced touring riders on this forum. Because I heeded their advice, sometimes in minor disagreement, that touring bike is the least 'upgraded' bike I've ever had in spite of it being a parts bin / budget build. After my first loaded experience, I fully fell into line.

So far the only replaced items have been a saddle and tires.
Brad