I left one of mine out all last winter and the top of the bag gave way . I covered it with a garbage bag and foune a cardboard box that it would fit in snug . I have found that the 1st couple arrows sag when you shoot and the corrugated keep them standing straight . Every once in a while I put some new cardboard between the box and the bag . I hang the target off the ground and cover it with a weighted tarp . I have never had a pass through with the Monster Bag !