Except that silver labs came out of a single kennel that ALSO bred Weims, and silver labs were unheard of -- as in, did not exist -- until this one kennel started producing them. Or so I'm told by people far more knowledgeable about Labs than I am.
I use plastic tubs (I think most of them are ziplock brand, actually) because I can reuse them. I did ziplock bags for a while, but washing then was a pain, and eventually I stopped washing them and just chucked them.
So I invested in some tubs. I have three sizes: very large ones that will...
My raw supplier offers a beef/tripe mix with liver and heart that I feed instead of just plain tripe as a muscle meal; it's got the organs already included and it isn't quite as stinky as pure tripe. So, my guys get it at least once a week, if not more often.