Hi all,
I am happy to find that many of you share the photography interest as well.
While none of my hydration packs have yet to leak, I am squeamish about putting a digital SLR and lenses so close to a water source.
With the lowepro toploaders, I was thinking about that. I probably will not be carrying a 70-200VR, not that I have one ... but anything that size would just be too bulky to lug around.
I am still favoring the Lowepro slingshot bag, just because there is room to carry more should I need it. I could fit in some spare tubes, and a minipump as well.
In regards to the split focus screen, I have to say that even with an aged digital camera like the D1x, the AF is very good. I have not needed to focus manually very often. The professional Nikons, D1&D2 range probably have the option for interchageble focusing screens.