It is easy to fill and move once filled, as there is a handle that pops out for moving, and slides back into the frame of the weighted base. one of the four bases has a leak, and unfortunately for us, it meant that the umbrella tipped over in a wind storm (even though it was folded up and put away for the night). it had lost enough weight from that one cell being empty, and we suffered damages to our umbrella.  We now know not to use that one and screw the umbrella base to the deck as well.