S24O = sub 24 hour overnight. Riding, camping and returning within 24 hours.
S36O = sub 36 hour overnight
We plan on going a little farther than an S24O would allow.
Also we are bike camping this time, and using ultralight backpacking equipment so 20 lb will not be a problem.
This was more of an empirical question about what "light" is in the touring world.
Thanks for the responses,
Tom