Originally Posted by Ol' Grog
All the extracts weigh in at 6.6 lbs, even if you take the conversion of the DME added with LME, it still comes out to 6.6 Is that the holy grail amount for extracts? What stops you from increasing that amount? Would that be too much fermentables?
Many extract producers are not in this country, and so use the metric system. One can is 3.3 lbs, but it's exactly 1.5 kg, and two cans even makes a good average gravity beer, hence 6.6 lbs. If you were anywhere but here, the recipe would be 3 kg of extract. American producers often use just 3 lb. bags, so there is slightly less in the package.
As far as increasing the amount, you can. You end up with higher gravity, stronger beer. However, you then need to add more hops to balance out the malt. A weizenbock is a stronger version of weizen beers.