If you pack an new thai bag right it can feel like kicking a steel pole w/ only rags and old blankets from the salvation army/good will. Gravity & time will be the 2 best things, so be patient. Make sure there are no gaps or it may settle un-evenly. Some people place a 25 lbs plate on the top to expedite the process. Don't forget its there!
Sand is ok and good, but go EASY on it b/c it adds a ton of extra weight that can take a toll on the structure that you are hanging it from. Too much sand will cause your bag to bottom out. Be careful! If so you may need to build a bra type suspension system w/ duct tape to reinforce the bottom.
Periodically take it down and flip it up side down or on it side to let it re-settle. Everyone has a certain feel that they like, so ultimately it is up to you. Depending on your shin conditioning...I myself prefer a hard bag b/c I like the contact, plus Im used to it.
All suggestions posted so far are good. Its you're bag, pack it how you like.
Best of luck!!
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