Thanks for all the responses and sorry I didn't respond earlier - the weekend was quite a journey, but that's another story (see NC Photo Gallore and Fuelly topics ).
During weekend, I've tested my transport net while strapping my backpack to passenger seat and going for a little trip.
While the backpack only had few items in it, I found it to be a very nice solution for those rides where I just need to carry basic stuff. Initially, it was a little weird as I simply got used to wearing a backpack the whole time, but I appreciated back-free experience very quickly. Especially on my way back, when it was dark, and my bright-color jacket was seen from far (no cars were getting close to me and were switching lanes to overtake soon!).
Also, I had my book back from my dad (which is quite a heavy one! the book, of course ) so I tested the net with a little more weight - still no problem.
This made me think that actually the net may be just enough to drive to work without carrying all the weight on my back, will have to make some careful tests. When the rain stops. I really liked the idea of getting the top box mounting plate first and strapping stuff onto it, if net turns out to be insufficient - that seem to me the way to go
Still, that's a short-term solution, I definitely want Honda's luggage system as it just looks lovely on NC S. Plus, I can use the same key to open it so that's an added feature.
Thanks for sharing all your experience!
I also had to get rid of the backpack. In sunny and humid Florida it made me get to work in the morning with my back drenched in sweat.
lol L.B.S I just loosen the straps a bit so the weight sits on the rear seat ,not possible with little packs though. In cold winter a tight pack makes my back the only warm spot if I havnt got my heated jacket !
Never carried food like strawberries in the topbox. When empty the topbox does buzz and rattle. As for laptops, as long as it is some kind of bag to keep it from banging on a hard surface then it is fine. Laptops are tough as long as they are closed and nothing is bouncing on top of it. They have 2 main week points. The disk drive and the screen. The disk drive can handle a lot as long as it is powered down. The screen is vulnerable to pressure from the outside (don't step on a closed laptop and don't let an animal step on it). A good laptop bag is stiff and padded around the compartment for the laptop.