Gridfinity compatible multicolor Bambu Lab A1 Sauce Bottle. Print at any infill you like, I recommend at least 15% and at least 2 walls. Pre-sliced file is in ABS but any material will work.
Do you have a version without the Bambu logo and that just looks like a regular bottle of A1? I bet that would get a ton of downloads, a keychain version would be even better!