Since you are already moving everything, I would say:
Put the substrate in a 5 gallon bucket and pour tank water over it to keep it moist; don't want the benificial bacteria dying. (Only fill the bucket as full as you can carry,; this might take a few). You can buy lids for the buckets.
Do the same with any decorations you have (bacteria on them too)
I asked my LFS for some of the bags the send home fish in. I offered to pay for some, but they just gave them to me. After bagging (and then rebagging just in case) my fish, I placed the bags in a styrafoam cooler so that their temps remained as stable as possible.
How far are you moving? I honestly would transport my water too, to put into the tank at the new place, because of any possible differencees in the tap water.
Hope this Helps!