Backpack through thailand, Laos and Cambodia

And Burma if it is possible.

I want to spend there at least 2 weeks in every country, to feel it, to know the people and understand their lives.

actually…i have already booked my ticket to thailand. i plan on entering laos through huayxai but am having trouble getting a visa. the agency im trying to get my visa thru says that i need an itenerary with proof of departure in order to obtain a visa. can n/e body offer me n/e tips on this?? eventually i wanna get thru laos and end up in siem reap in cambodia. how do i show proof of my intention on this??

I am in Laos in October and want to do a hike into the backcountry

because the big ones weigh too much and aren’t any fun!