Need a favor (Hanoi)

Hi All,
We left a bag of our things in a hotel in Hanoi and are now in Bangkok. We will be flying back to the Staes to visit family in the next few weeks, and need to bring that bag as it had gifts for family and other necessities in it! Would anyone be able to get a box, put our bag in it, and mail it to us in Bangkok? We would pay for the shipping charges and something for your time and trouble. The hotel is in Hoan Kiem Lake area.
Thanks,
Lisa