Hello, I will travel in thailand in 2 days, and I need to buy 2 backpacks for me and my gf. do you guys know a place to buy this, really cheap?

Probably at Lousiwan or Taobao if you have an account or your gf has an account. Be aware of the fakes.

dare I suggest heading to the backpack district again?

seriously though... www.gokunming.com/en/forums/thread/12137/buying_a_new_backpack