I read somewhere about a photographer who makes his own camera ruck sacks from commercial walking rucksacks. He buys foam, and then cuts out holes for his lenses. I think you could do the same, using tape to hold the foam together so that it doesn't go rolling away when unpacking.
I've just remembered that the photographer is Robert Thompson and the description is in his book about photographing insects. He worked it such that when the rucksack is lying on its back, he unzips the back panel, to expose the homemade compartments. Hopefully my summary makes sense. You could make a few compartments for camera gear, and leave the rest for your climbing malarkey. It sounds much too strenous for my tastes. Now where did I put my slippers ...
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