Perhaps we'll be able to see a satchel with the update. Find it funny we still put fish in a invisible satchel.
I've found animal fat by Owanjila up to Big Valley,that's a good spot too. During the day you can find ducks, geese, beavers, & wild boars. At night I've only seen beavers & boars spawn.
I like Flatneck station & Dakota River too.