dude, they're so light, ultra-light dare i say!
carry more than you need, enough to share.
never know when you might run out with no
chance of replacement.
certain countries have few bike shops. bikes
are purchased at local farmers' markets.
spares are not available. tubes, if you can
find them, are the wrong size, or wrong valve.
patches? bwhaahahahahah! no. no patch kits,
no patches, no glue.
gotta find a mr. spock on the street corner.....
get vulcanized.