Hi Dave, I would suggest a Domke or Tenbo canvas bags. Look like normal bag, not camera bag, and some of the smaller models would be just for that. And as I can attest, even it doesn't look weatherproof, my Domkes survived day-long downpours at a sporting events without the cameras inside getting wet.
I would suggest one of the 800 series (803?). Or the Tenbos, these are somewhat more advanced (more pockets), and probably as well made. The toploaders "zooms" just look ugly. No offence meant to other list members, but what photographer in their sane mind would take a toploading "zoom" bag like Lowepro? It screams mug me all around ;-) Frantisek