This is a proof case designed to be used inside a Daiwa cooler box. The product number is PC-1120(M). I purchased this at a fishing tackle store several years ago, but I hadn't checked the compatibility, so it was not usable with the cooler box I use and has been in storage. Compatible cooler boxes are Daiwa's Cool Line II 11L and 20L. Although it is a new, unused item, the packaging bag is torn in places, so please refrain from purchasing if you are sensitive to such details.