they are flip top lids for 2L pop bottles, they help keep the pressure in, i hate having my pop going flat after a few days. i found out about these nifty things one drunken night at a buddies place. he told me that safeway has them, but ive been to 3 safeways and none of them have it (i tried asking 3 employees and a manager at 1 store ).
theyre the smallest little damn things, and my friend told me they were end fillers too, no normal home for them. if you see them (if you know what the hell im talking about) please let me know what store that it is, i want them bad!