I
sometimes use a wet pail for prefolds...but I must say, lately I've been getting lazy and I just throw everything (dipes & covers) into an open lined wicker basket in our laundy room. As long as I wash every other day it's just fine. I do spray prefolds with Bac Out, so that takes care of any potential smell.
I guess what I'm saying is, you probably don't need a pail. Wetbags are great, and easier to carry to the laundry room, too!