Not as advertised

I got a Large timbuk2 and from the rides i've taken it on, it isn't very comfortable. I got a strap pad, hoping this would fix the problem but it still persists. When i bought the bag it didn't come with the strap pad or a cross strap but from carrying a chrome citizen messenger bag and this, the chrome definitely beats it in at area of comfortability . The one plus is that it definitely is very roomy.