Check out this HD video I took with my Flip Camera of Los Angeles based yoga teacher Brian Aganad doing a handstand in an elevator! He had his hat on so he could not see.
Handstand is incredibly challenging to do if you do not have a drishti to focus on. To add to that he has his backpack on and his Manduka Black mat strapped on his back as well. Enjoy!
View on my YouTube channel
Kukhahnyoga's Blog 
Amazing! Random question, what type of backpack is that? Thank you!