44 lbs is not alot of weight, your right...but remember this bag will be your new best friend that will never leave your side. To bring one too heavy will not only give you a bad back, but you will be knocking people over as you walk down the street.
On some airlines you can pay to bring in "Over Sized" luggage., I found this link that might be of some help to ya Thai Cargo
or it could be just as simple as asking the employee at the desk when you get to the airport.
No matter how big your pack is, you will still need to wash your clothes
Just remember, if its not stained and does not have "Da Funk Smell" go'n on, you can wear things a couple or a few days in a row
If worse comes to worse you can get in touch with them and ask for their advise on what you should do about your situation. Thai Air Feedback