What is the conversion from liquid ounces to pounds to determine the actual weight of something?

I lift packs of beer that contain up to 20-12 oz. cans. I would like to know how much weight a 20 pack of 12 oz cans weighs in pounds.

1 gallon of water weighs 8 lbs without the container.

You “lift packs of beer” sounds like you work in a beer depot or a store, are you sure there isn’t a scale around for you to just weigh it?

I you “lift packs of beer” at home, do you have a bathroom scale?