I would definitely recommend the RS-Sport, ther is no question about it. The RS-5 tends to slide around up and down your shoulder, especially if you kneel down, lean forward or bend over. The RS-Sport stays put and comes with two bumper stops for in front of the camera and the other one for behind the camera. There is an underarm adapter available separtely for the RS-5 to help it stay in place, which looks like a good solution. I don't think the extra pockets on the RS-5 would work well with a backpack as the extra padding will get in the way of the backpacks shoulder straps.
There is also a newer RS-Sport2 version which is a little thinner and less bulky along the shoulder than the original RS-Sport. So, this may be more comfortable when used in conjunction with the shoulder straps on a backpack. The newer version is also less bulky to stow away (keep in mind I've never used the version 2 model).
Rich





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