What do you think of Designer Knapsacks ?

I have a huge backpacking backpack (for camping and stuff, it's my main piece of luggage and has been very loved by me), and I liked my jansports there for awhile but once I got a laptop and didn't have to haul books around anymore, I stopped wearing them to school.
and I don't like it when non-tourists wear backpacks around, it looks kinda shady.
 
I was thinking about getting the LV backpack but I would only wear it to like Disney World probably. But then I'd probably worry about someone dropping a mickey ice cream bar on it!