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Brew-in-a-bag (BIAB) is the easiest and most economical way for an extract brewer to step-up into all-grain brewing. What makes this method (which was made popular by Australian homebrewers) unique is that you can basically do with one kettle what traditional all-grain brewers do with three separate and distinct vessels.
When used for building yeast starters, the continual stirring of the stir-bar provides constant agitation and aeration of the yeast. The result is smaller starter sizes and less time needed to build more yeast cells.
The Wiz discusses a question about dextrin malts and another about brewing high gravity beers.