my only problem is water bottles get easily crunched, there not the most durable plastic and when I'm out on the ice I need some durability in my gear.I like the swimming noodles or pipe insulator methods best, there pretty much crunch proof.The plastic water bottle idea looks great in the house but I can see it coming out of my sleigh flat with holes in it, plus it would take up alot of room in an 8" or 6" hole.