I have a garmin 510 which I really like and use on my road and mountain bikes. I have cadence and the soft strap hr monitor. It will also pair with power meters, as well as my phone and you can let people know you are riding and they can track you in real time.
It is overkill, but I love my gadgets. A 200 is perfectly fine.
For a backpack for commuting, I have an osprey talon 33. I carry my clothes and laptop. It's lightweight and fits extremely well. It is Not waterproof though. I put my stuff in a garbage bag inside my pack.
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