Hmm, that's useful Alan as I've just ordered a used Toploader 50 for when I'm out hiking with a rucksack - I like to have the camera available so your comments indicate that I've picked the right case (I'd only have a 50mm or 18-70mm on the camera). I use a little Tamrac Aero zoom for my GX1 and that works perfectly, all the filters etc. just go into the rucksack lid pocket.
It's bags for solely photo trips to keep everything handy that are difficult to choose - too big, too small...
Talking of Crumpler, I like the look of the 6 million dollar home, but it's not available from what I can see.