The trouble with taking it to a laundromat is that I think most of the machines are locked closed for the cycle so no one gets hurt. I always
check my felted items multiple times to make sure they aren't getting bent or over felting. Some yarns don't take the whole cycle.
I felted slippers recently, but they of course were able to fit in laundry bags. I think they make bigger ones, but I'm not sure. Some of the fuzz was in my washer anyway. I was able to just take it out.