You will want a pump that can move about 4 1/2cuft of air for what your doing. The max hgin is not as important. You don't really want to pull down over 15hgin.
There are a lot of pump's that will pull down to 29hgin available out there. The problem is that they will not handle a lot of volume. You need one to pull at least 4 1/2 cuft of volume to make up for any leak's in the bag.
I suggest a port like this one.
