why do you want to backpack??
i thought only westerners entranced by a romantic view of the East did things like that.

i suggest taking it easy and staying at a comfortable place. and don't take too much luggage!
the closest thing i ever did to "backpacking" was trekking in mountains of Nepal. I injured my knees, had diareahh (spelling?) almost everyday, and almost fell off a mountain once. (God in His mercy rescued my life, thankfully

)
Once you enter the military, you'll probably have enough "backpacking" to last you several lifetimes!