This is a cooler box I used for board fishing and small boat fishing. It's sturdy, has a manageable 9.6-liter capacity, and I found it very easy to use. It seems to use urethane insulation, which is good for heat retention, and the lid opens and closes with a one-touch mechanism, making it very convenient. I'm selling it because I no longer go fishing. I've made a few modifications myself. One is to the drain plug on the bottom. Since I drained the water by tilting this small cooler, and for convenience when washing it, I've glued the small screw in the center. Of course, you can remove this entire part by turning the butterfly screw on the outside of the bottom. (See photos 6 and 7) The other modification is that I shortened the strap a bit because it was too long and difficult to use. (See photo 8) It's still perfectly usable. No returns or refunds, please.