I keep a plastic bin in the tack room for clean pads. Dirty pads/towels/polos come home with me as they get dirty and go in to a plastic bin next to the washer until there is enough for a load (or I have no clean pads left in the tack room bin;)). Clean laundry comes back to the barn as soon as its done.
Clean pads live in my tack trunk, with the current pad-in-use living on top of my saddle on its rack in my locker. I attempt to keep a laundry bag in my car for the dirty pads/polos/girths/whathaveyou, but it all generally just ends up in the trunk and makes the car stink.
I’m impressed that most of you can fit saddle pads in your tack trunks. Mine is overflowing already without saddle pads (although I do have two grooming bags that have to fit in there…one for each horse but I still wouldn’t be able to fit pads if there were only one).
In use pads are upside down over the saddle for the horse they go with.
When in-use pad is dirty, it gets taken home and put in the dirty pile in the garage and is replaced by clean pad that comes out of the clean pile in the garage.
When there is only one clean pad per horse left, the whole dirty stack is taken to the laudromat and washed, one load darks, one load lights. Once they are dry (I have a clothesline, YEA!), They all go into the clean pile in the garage.
thank goodness of garages, is all I can say.