Used a few times. The following is quoted from the official website: - ・The materials used are CORDURA fabric, which is highly resistant to friction, tearing, and abrasion, and PVC tarpaulin, which is waterproof and resistant to dirt. The inside is made of high-frequency welded PVC tarpaulin, making it resistant to punctures and tough. ・It can be folded and stored compactly when not in use, and is also convenient as a regular shopping cooler bag. 6-layer structure for cooling and insulation. The inside is also made of tarpaulin material for a tough finish. ・The height is such that 350ml juice cans or beer cans can fit vertically. ・A mesh pocket is attached to the underside of the lid, and the structure allows for efficient cooling of the interior by inserting your own ice packs. Also, a mesh pocket is attached to the back, which is convenient for storing cooking utensils, etc.