ABcrack, responses regarding your product will likely be overwhelmingly negative or humorous. Here is why:
It is likely that you are an outsider to skateboarding. As with many social groups with younger participants, skateboarders tend to be wary of outsiders. Partly due to the spirit of the culture and what we deal with on the street, skateboarders can also be somewhat anti-authoritarian. So if you tell us that you're "killing the game", we tend not to believe you.
It would also appear, after unfortunate viewings of your videos, that you may have confused the grouping of "skateboarding" with other activities that involve rolling on a planks of wood. While it would take far too long to explain why, let's just say people who like Jimi Hendrix and the Rolling Stones probably would not listen to Nickleback even though they all play "rock and roll". Hence, one of your models rolling around carpet on an electric-powered deck while wearing one of your stripey backpacks looks very strange to most posters here.
Finally, the product itself does not seem to serve a purpose. Why does the fabric wrap around the nose and tail, but not the trucks? Is the inside reinforced to prevent griptape abrasion? Is it rip-stop, ballistic, cotton duck? Why does the board go right up against your back? It seems like you'd hit your head and ass with it, especially with the nose and tail pointing inwards. I sometimes use a backpack with a strap when I'm traveling--most are designed to hold the board behind the bag so that you could roll it. But what scenario would I use this little thing when I could just hold my board?
While the current offering of skate bags by actual skate companies leave much to be desired, your product does not address any of the existing shortcomings in that market.