Unused, new On Soft Flask. Thermoplastic polyurethane (TPU) 65%, Polypropylene 21.5%, Silicone 10.1%, Polyoxymethylene 3.4% [Capacity] 500ml [Features] BPA-free This is a safe flask that does not contain harmful chemicals often found in plastic products. Leak-proof design It has a leak-proof lid and will not leak even if turned sideways or upside down. You can quench your thirst with peace of mind. Wide opening To put in drinks or wash, just remove the top of the bottle. Very easy to clean. Capacity: 500-999ml