In reply to The_flying_climber:
I'd go for different ones for different things. I carry:
very small very light ones for clipping the rope, e.g. quick draws
bigger key lock ones (heliums) for tying the rope to and sling draws
coloured ones for all cams
big oval ones for carrying wires (I paint these by hand to colour code the krabs as I can't find coloured oval).
PS. I don't climb snow and I have small hands.