Darchei Noam:
The small cans are somewhere in the range of 12oz. Larger ones will be over 40oz.
Rabbiofberlin:
>>darchei noam- first, there is a material difference between shabbos and yom tov. I suppose that on yom tov it is muttor accordign to all poskim-as it is clealry oichel nefesh.<<
This is a very dangerous statement. Not all melachos are allowed on Yom Tov due to Ochel Nefesh. Kotzer (harvesting), Ma’amar (bundling the harvested produce), Dash (threshing and squeezing out juice) Zoreh (winnowing), Tzad (hunting) are all forbidden eventhough they could be justified as ochel nefesh.
Additionally, Borrer (selecting), Tochen (grinding) and Meraked (sifting) are melachos which will be allowed on yom tov for ochel nefesh only if certain conditions are met.