I use a cheap one (XL) from Menard's. Seems like it's a different brand name everytime I buy one (every 2 - 3 years or so). Some of these are almost more like dust covers than full outdoor weather covers but get the job done. I wouldn't use one of these for outdoor storage but I don't need that. If I expect heavy rain overnight on the road, I'll throw a large plastic bag over the seat, under the cover since that's seems to be the only problem area. I always have a couple of those large plastic garbage bags with me anyway.