This is a 9L cooler box from Shimano that uses a vacuum panel on the bottom. It was purchased along with other 9L sizes of the Fixcel Light and Premium series for comparison. It has only been used to measure the melting time of a 1kg ice bag, so there are no stains or marks. Although it only has a vacuum panel on the bottom, it keeps ice longer than the Light series. It has a one-touch opening for easy access, which is convenient for small-item fishing. Shoulder strap is not included. Cooler Box Capacity (L): 9 Weight (kg): 1.75 Cold Retention Time (approximate): 30 hours (cold retention time with 20% of the cooler's capacity in ice at an outside temperature of 31 degrees Celsius) Internal Dimensions (Width x Length x Height): 160 x 260 x 220mm External Dimensions (Width x Length x Height): 208 x 360 x 280mm Materials: PP + Foamed Urethane + 1-sided Vacuum Panel Color: Pure White SHIMANO