Quote Originally Posted by neuroanatomist View Post
I'd go with the RS-4...I often wear R-strap and a Toploader - the latter on my left side (strap on right shoulder), with the two straps crossed across my chest.
+1 on this advice. It's very easy to wear the RS-4 with a pack, top loader etc. I did 12 days in Israel with the RS-4 and a larger camelback (RS-4 under the camelback straps) all day every day. Can't imagine having done this without it!