I have been runcommuting for 3 years and this is my favorite bag so far. My last 2 other bags broke so fast but this one is durable. It is very lightweight and easy to carry. You can put your clothes, your lunch and some running gear in it if you need a raincoat for example. I usually don't care about how my run commuting bags look like but this one is really cute and compact. I used to attach another bag with my computer in it to my backpack when I needed to bring it home after work but this one is big enough to fit in the bag and there is no risk to break it. No shaffing also and I run 15 to 18 kilometres 5 times a week to go and back from work.
The runbox was a perfect fit to my frame of 1.6m and 56kg, with all the strap pulled to the maximum. The bouncing was minimal and I run it for at least 4 times of around 8km. The bag is waterproof and the interior of the bag was dry after the run. My laptop seems perfectly fine. The amount of bouncing is equivalent to normal walking. I can say it is a well invested purchase since I could now continue to commute from office to home with my laptop now.