I just spent only two weeks in SE Asia, and used disposables as it saved so much space. I agree, your Ergo is much more important. I used mine ALL the time, I didn't bother taking a pram (hardly use mine at home anyway). I got my washing done by an old lady who lived in the street behind the hotel, she had a machine but I would feel awful giving her a pile of wet nappies. Also I didn't want to carry a wet bag full of dirty nappies with me as carry on luggage. It was awful though putting my bub in disposables after only using beautiful MCN's. But it's not for long and nappies in Asia are very cheap and easy to find (usually find them in convenience stores etc) and the ones I found were pretty good (for disposables anyway)- even overnight no leaks, and my boy is a very heavy wetter.

Have fun, the locals will probably go crazy over your baby! I met so many people I wouldn't have otherwise because of my baby

PS Don't forget your Ergo won't add to your luggage or carry on weight if you are wearing it when you check in