Well, the new portable I bought this year is has the canvas top fastened to the sled with little snap hooks. So, I unsnapped them, folded the canvas and put it in a snap lock plastic tote. That should assure me of no mouse holes come winter. At first I wasn't crazy about the snaps, but it is handy for storage. I've also been starting my power auger once a month and letting it run for a few minutes. I don't know if that helps, but I figure it sure can't hurt.