I don't have the cash for it yet (been saving for a new lens and just recently ordered a Bigma, so the bank account is a little starved at the moment), but I've been considering the Kata R-103.
I would be carrying:
50-500 "Bigma" (soon to come)
Flash bracket for macro work
And space for other bits and pieces - CF cards, shutter release etc.
I have to admit I'm not a big fan of backpacks, having mainly worked out of shoulder 'gig' bags for the most part, but I know all this gear is too much to strain only one shoulder with.
Mainly what I need is a daypack that could also work as a travel bag. It would have to be waterproof/resistant as I will be working in humid conditions in the future (rainforest).
Is the Kata sufficient for my needs? The build quality and size seem good. Are there any better alternatives? Cost is a concern - I would prefer for it to be around $120-$150.