I like to use dip bait in the winter, so I came up with the idea of using the throw away hand warmers and a small ice chest to keep my dip bait soft. I put a hand warmer in the bottom, them set the tub of dip bait on it. I then put one or two around the sides. I cut a piece of stryofoam that will fit down on top of the tub. When you go to re-bait you can grab the hand warmer to warm up your fingers. The hand warmers will last all day. I watch for them to come on sale in the spring, then stock up for the next winter. As long as you leave them in the original package they will stay good. At the end of the trip, if I'm not going to fish the next day, I wrap the used hand warmers up in paper and put them in the trash.