here's some info on MRE's

http://www.ki4u.com/mre.htm

from the looks of it they seem kind of heavy.

and reading the descriptions:

http://www.campingsurvival.com/fulmremilrea.html

the 12 pack case weighs 19lbs. so it's at least over 1lb per meal might as well carry the fuel and stove and use the water in your since you are touring and would be carrying water anyways.

Another thing I'd be concerned with is health, you need energy to tour long distances and these things are made to survive nuclear disasters and 10 year shelf lives. It's pumped full or artificial preservatives that would probably put formaldehyde to shame.