100% agreed. This is definitely an option. However, I like the additional dust protction properties of the second lid (and potential protection factor).
I have now taken this bag for a couple of more hikes, here in Glacier NP where I havehad to deal with higher elevationsand snow. It is a great bag and the fit is very customizable. It really molds well to the back if you tighten all of the straps (including the adjustable straps on top). Over-all, I highly recommend this pack!