Abstract: A storage sleeve comprised of a plurality of side panels defining and open-ended hollow box-like structure appropriately sized for placement in a conventional cooler container and surrounded by a coolant. At least one of the plurality of side panels includes a mesh-like section to readily facilitate heat transfer therethrough. When the storage sleeve is placed within the cooler container and at least partially surrounded by a solid coolant such as ice, the box-like structure as defined by the plurality of side panels prevents the coolant from occupying the storage area. At the same time, the mesh-like section accommodates heat transfer between the storage area and the coolant itself.