- DON'T SOAK FILTER MATERIAL IN WATER.
Drain the water out of the filters and leave the pads in them. The good bacteria in them will stay alive as long as the pads stay moist which will be hours. If you place them in stagnant water, the lack of O2 will allow anaerobes to quickly replace them and when you get the tank back up, your water-transported filter pads will be dumping hydrogen sulphide into the tanks.
An alternative to draining the filters is to set up a "tank" and a 110 power source to run the filters during the trip.
The Cleveland Aquarium set up many experiments, which the two methods above showed top results, to see what the best way was to transport "elderly" fish and to transport biological filtration systems. They moved their fish from the old location to the zoo with almost no losses. The loss was the huge sturgeon who vandals tried to steal and killed.
They had new tanks and new filters all running, so in that situation the best method for them was to transport buckets of muck from the filter system while aerating it, and dump a few buckets into each new pristine blue tank, turning them all opaque tan, which overnight turned to complete clarity but a whiter color.
(Jackie, I prefer getting old to the alternative....)