A boot is anything you can put inside a tire to keep the tube from poking out
of a slit in the tire. Possible objects could include (gleaned from old posts here):

a small section of an old tire
a dollar bill
a gu pack
wrapper from Powerbar, etc
cardboard
single-edged razor blade and duct tape

http://forums.teamestrogen.com/showt...highlight=boot
http://forums.teamestrogen.com/showt...highlight=boot
http://forums.teamestrogen.com/showt...highlight=boot

I wonder if there are any leaves or other natural material strong enough to boot with? Anybody ever tried?