Instead of using bags, you can get a cheap bucket or buckets with lids. A 5 gallon bucket from Home Depot is only a couple dollars (in the US, not sure of your location) and they are useful for other things once your move is complete. Do not use a bucket that has ever had any chemical in it. Get new buckets or you can harm/kill the fish.
As for the filter, make sure you only keep the media submerged, though it can go a pretty long while without killing off a significant portion of your bacteria. Just keep the media in a small amount of tank water and it'll be fine. You can probably skip this since your move is so short. Remember also for longer moves, in addition to your filter media, also keep gravel, decorations and plants submerged in aquarium water. The bacteria lives on all surfaces in the water so this will help keep your colonies at about the same levels (kill off all the bacteria in your graavel and you can have a mini cycle). Again, your move is so short, I wouldn't worry.
\Dan