if it is only a 45 minute drive, I would keep it simple...a 45 minute drive is quite short and no need really to keep the pump running and bagging fish...(this is just my opinion though)
get two 5 gallon buckets from your local hardware store w/ lids (lowes sells them for $3).
Fill one bucket with your tank water and put your mollies in that.
Fill the other bucket with tank water and put your gravel, decorations and filter media submerged in the water.
when you get to your new place, first thing will be to get the tank set-up where you want it, add the gravel,decorations and re-assemble the filter. add your fish and you're set-to go.
I've moved my 55 gallon over 400 miles using this system and I haven't lost a fish