I lost the gasket for my Starbucks stainless steel bottle (the type in the photo, 355ml). Since the official Starbucks spare parts were sold out, I looked for a suitable replacement using a commercially available silicone ring. I bought one and tried it, and it works fine without any leaks. I'm listing two of them from a bulk pack, as I know others are looking for these. Please note that these are not official Starbucks parts, and I do not guarantee they will function the same way as the original. Please refer to the photos to see what they look like. If the rings don't fit your bottle, please understand that returns are not accepted. Please note that the bottle in the photo is not included. The listing is for the two silicone rings only. They are new and unused, but I opened the original bulk packaging, so I will ship them in a different bag. I've priced them to help those in need, so please consider purchasing them at the listed price. Immediate purchase is welcome. Thank you.