Translation of knapsack in German

A little latter we came back to our home and Leonard offered me to take me around the city with his motorbike. I could not refuse although I am a little scared by these vehicles, as they are dangerous.
When we contacted you, our trainer was indeed for students only. We made some upgrades since then. Our site is now a vocabulary platform, because we support the creation of lessons by teachers and sharing.
In the end we decided just to take the picture and place it as the logo. It seems nice and it may make the user more curious, so that he will go to your page. Tell me if you do not agree with me!